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ID

VAR-202104-0615


CVE

CVE-2021-1792


TITLE

Apple macOS CoreText TTF Parsing Out-of-Bounds Read Information Disclosure Vulnerability

Trust: 0.7

sources: ZDI: ZDI-21-148

DESCRIPTION

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Apple macOS. Interaction with the CoreText library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.The specific flaw exists within the parsing of TTF fonts. Crafted data in a TTF font can trigger a read past the end of an allocated data structure. Apple CoreText is a core component used for drawing text in mobile devices by Apple in the United States. A resource management error vulnerability exists in Apple CoreText, which is caused by the application not being in the boundary condition of the CoreText component in macOS. A remote attacker could create a specially crafted file that tricks a victim into opening it, triggering an out-of-bounds read error and reading the contents of memory on the system. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 APPLE-SA-2021-02-01-3 Additional information for APPLE-SA-2021-01-26-2 tvOS 14.4 tvOS 14.4 addresses the following issues. Information about the security content is also available at https://support.apple.com/HT212149. Analytics Available for: Apple TV 4K and Apple TV HD Impact: A remote attacker may be able to cause a denial of service Description: This issue was addressed with improved checks. CVE-2021-1761: Cees Elzinga Entry added February 1, 2021 APFS Available for: Apple TV 4K and Apple TV HD Impact: A local user may be able to read arbitrary files Description: The issue was addressed with improved permissions logic. CVE-2021-1797: Thomas Tempelmann Entry added February 1, 2021 CoreAnimation Available for: Apple TV 4K and Apple TV HD Impact: A malicious application could execute arbitrary code leading to compromise of user information Description: A memory corruption issue was addressed with improved state management. CVE-2021-1760: @S0rryMybad of 360 Vulcan Team Entry added February 1, 2021 CoreAudio Available for: Apple TV 4K and Apple TV HD Impact: Processing maliciously crafted web content may lead to code execution Description: An out-of-bounds write was addressed with improved input validation. CVE-2021-1747: JunDong Xie of Ant Security Light-Year Lab Entry added February 1, 2021 CoreGraphics Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted font file may lead to arbitrary code execution Description: An out-of-bounds write issue was addressed with improved bounds checking. CVE-2021-1776: Ivan Fratric of Google Project Zero Entry added February 1, 2021 CoreMedia Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: An out-of-bounds read was addressed with improved input validation. CVE-2021-1759: Hou JingYi (@hjy79425575) of Qihoo 360 CERT Entry added February 1, 2021 CoreText Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted text file may lead to arbitrary code execution Description: A stack overflow was addressed with improved input validation. CVE-2021-1772: Mickey Jin of Trend Micro Entry added February 1, 2021 CoreText Available for: Apple TV 4K and Apple TV HD Impact: A remote attacker may be able to cause arbitrary code execution Description: An out-of-bounds read was addressed with improved bounds checking. CVE-2021-1792: Mickey Jin & Junzhi Lu of Trend Micro Entry added February 1, 2021 Crash Reporter Available for: Apple TV 4K and Apple TV HD Impact: A local user may be able to create or modify system files Description: A logic issue was addressed with improved state management. CVE-2021-1786: Csaba Fitzl (@theevilbit) of Offensive Security Entry added February 1, 2021 Crash Reporter Available for: Apple TV 4K and Apple TV HD Impact: A local attacker may be able to elevate their privileges Description: Multiple issues were addressed with improved logic. CVE-2021-1787: James Hutchins Entry added February 1, 2021 FairPlay Available for: Apple TV 4K and Apple TV HD Impact: A malicious application may be able to disclose kernel memory Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. CVE-2021-1791: Junzhi Lu (@pwn0rz), Qi Sun & Mickey Jin of Trend Micro Entry added February 1, 2021 FontParser Available for: Apple TV 4K and Apple TV HD Impact: A remote attacker may be able to cause arbitrary code execution Description: An out-of-bounds read was addressed with improved bounds checking. CVE-2021-1758: Peter Nguyen of STAR Labs Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to a denial of service Description: This issue was addressed with improved checks. CVE-2021-1766: Danny Rosseau of Carve Systems Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: An out-of-bounds read was addressed with improved input validation. CVE-2021-1785: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: An out-of-bounds write was addressed with improved input validation. CVE-2021-1744: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution Description: A logic issue was addressed with improved state management. CVE-2021-1818: Xingwei Lin from Ant-financial Light-Year Security Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: This issue was addressed with improved checks. CVE-2021-1746: Xingwei Lin of Ant Security Light-Year Lab, and Mickey Jin & Qi Sun of Trend Micro CVE-2021-1793: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to a denial of service Description: A logic issue was addressed with improved state management. CVE-2021-1773: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: An out-of-bounds read was addressed with improved bounds checking. CVE-2021-1741: Xingwei Lin of Ant Security Light-Year Lab CVE-2021-1743: Xingwei Lin of Ant Security Light-Year Lab, and Mickey Jin & Junzhi Lu of Trend Micro Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to a denial of service Description: An out-of-bounds read issue existed in the curl. CVE-2021-1778: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 ImageIO Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted image may lead to arbitrary code execution Description: An access issue was addressed with improved memory management. CVE-2021-1783: Xingwei Lin of Ant Security Light-Year Lab Entry added February 1, 2021 IOSkywalkFamily Available for: Apple TV 4K and Apple TV HD Impact: A local attacker may be able to elevate their privileges Description: An out-of-bounds read was addressed with improved bounds checking. CVE-2021-1757: Proteas and Pan ZhenPeng (@Peterpan0927) of Alibaba Security Entry added February 1, 2021 iTunes Store Available for: Apple TV 4K and Apple TV HD Impact: Processing a maliciously crafted URL may lead to arbitrary javascript code execution Description: A validation issue was addressed with improved input sanitization. CVE-2021-1748: CodeColorist of Ant-Financial Light-Year Labs Entry added February 1, 2021 Kernel Available for: Apple TV 4K and Apple TV HD Impact: A remote attacker may be able to cause a denial of service Description: A use after free issue was addressed with improved memory management. CVE-2021-1764: Maxime Villard (m00nbsd) Entry added February 1, 2021 Kernel Available for: Apple TV 4K and Apple TV HD Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple issues were addressed with improved logic. CVE-2021-1750: @0xalsr Entry added February 1, 2021 Kernel Available for: Apple TV 4K and Apple TV HD Impact: A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited. CVE-2021-1782: an anonymous researcher Swift Available for: Apple TV 4K and Apple TV HD Impact: A malicious attacker with arbitrary read and write capability may be able to bypass Pointer Authentication Description: A logic issue was addressed with improved validation. CVE-2021-1769: CodeColorist of Ant-Financial Light-Year Labs Entry added February 1, 2021 WebKit Available for: Apple TV 4K and Apple TV HD Impact: Processing maliciously crafted web content may lead to arbitrary code execution Description: A use after free issue was addressed with improved memory management. CVE-2021-1788: Francisco Alonso (@revskills) Entry added February 1, 2021 WebKit Available for: Apple TV 4K and Apple TV HD Impact: Processing maliciously crafted web content may lead to arbitrary code execution Description: A type confusion issue was addressed with improved state handling. CVE-2021-1789: @S0rryMybad of 360 Vulcan Team Entry added February 1, 2021 WebKit Available for: Apple TV 4K and Apple TV HD Impact: Maliciously crafted web content may violate iframe sandboxing policy Description: This issue was addressed with improved iframe sandbox enforcement. CVE-2021-1801: Eliya Stein of Confiant Entry added February 1, 2021 WebRTC Available for: Apple TV 4K and Apple TV HD Impact: A malicious website may be able to access restricted ports on arbitrary servers Description: A port redirection issue was addressed with additional port validation. CVE-2021-1799: Gregory Vishnepolsky & Ben Seri of Armis Security, and Samy Kamkar Entry added February 1, 2021 Additional recognition iTunes Store We would like to acknowledge CodeColorist of Ant-Financial Light-Year Labs for their assistance. Entry added February 1, 2021 Kernel We would like to acknowledge Junzhi Lu (@pwn0rz), Mickey Jin & Jesse Change of Trend Micro for their assistance. Entry added February 1, 2021 libpthread We would like to acknowledge CodeColorist of Ant-Financial Light-Year Labs for their assistance. Entry added February 1, 2021 Store Demo We would like to acknowledge @08Tc3wBB for their assistance. Entry added February 1, 2021 This message is signed with Apple's Product Security PGP key, and details are available at: https://www.apple.com/support/security/pgp/ -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEbURczHs1TP07VIfuZcsbuWJ6jjAFAmAYgtcACgkQZcsbuWJ6 jjC2WQ//bJVyj/RBYwoj3boUw/SH7hZ+n6Ho3KPRZQE2XWZ0KSODHSoXOgaf5xX7 xWAf5vbOGdEueWj476hmlZZPediB7SJK6xEkvg3SKzZrc5+MlgRUjnrNd/qygi75 tPXjpkyIAHBY5Ik+uoSyxkLkCn3i50KFwtJCmyibl3ayb1XA2/jUA4FtQkhz3HrM ZhMkBPOSObKkGiyj90eBNmeJRSwrxvBQPcp/EwqHbND+Y8UYAQ9ZDbHXWBVuDeRV R1No2qLit0TCs6MZnVP2CKNprXMy/bHLlNeVYGGIu1W+qQ3I30XvlY69VcH6JdVF xz6JIiXAJoOYDUFzesY2b8kMe7jiZnnDK+gWHeodV4oirsImITTlGY4gdiGb30Ag 2XDFpGedK0g+fD+SKI0lCOColTi6IEtTRm4/0ClI0HMc0akJn3qZXOz+iXzTZCa3 tssd6H2lZAW98GmsnMazUdEyGR+9I9RSvaJkLNOBxgDG+NURoTJ6vxHH2B3DYb/+ i+blVGMt7EBIZNwloOR8Fc+Ho5YTCFIwSxeqUzS9Vw53Bx7qA0AVd6CPPJSctWZ0 WKg1N3iW+dBWLWr43idEUNgUADL8Ya35Q6EwW+FxMHLwS11d7xA24AT14vJyi+4w ftTKFGZsNaUGMo2dCZNUnyC23xv3R8GYso0jc3DL4e1pAmeW2Rk=0JBx -----END PGP SIGNATURE-----

Trust: 1.89

sources: NVD: CVE-2021-1792 // ZDI: ZDI-21-148 // VULHUB: VHN-376452 // VULMON: CVE-2021-1792 // PACKETSTORM: 161248 // PACKETSTORM: 161247

AFFECTED PRODUCTS

vendor:applemodel:ipadosscope:ltversion:14.4

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vendor:applemodel:tvosscope:ltversion:14.4

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vendor:applemodel:mac os xscope:eqversion:10.14.6

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vendor:applemodel:mac os xscope:ltversion:10.14.6

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vendor:applemodel:mac os xscope:gteversion:10.14

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vendor:applemodel:mac os xscope:gteversion:10.15

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vendor:applemodel:watchosscope:ltversion:7.3

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vendor:applemodel:macosscope:ltversion:11.2

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vendor:applemodel:mac os xscope:eqversion:10.15.7

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vendor:applemodel:macosscope:gteversion:11.0

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vendor:applemodel:mac os xscope:ltversion:10.15.7

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vendor:applemodel:iphone osscope:ltversion:14.4

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vendor:applemodel:macosscope: - version: -

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sources: ZDI: ZDI-21-148 // NVD: CVE-2021-1792

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2021-1792
value: HIGH

Trust: 1.0

ZDI: CVE-2021-1792
value: LOW

Trust: 0.7

CNNVD: CNNVD-202102-078
value: HIGH

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VULHUB: VHN-376452
value: MEDIUM

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nvd@nist.gov: CVE-2021-1792
severity: MEDIUM
baseScore: 6.8
vectorString: AV:N/AC:M/AU:N/C:P/I:P/A:P
accessVector: NETWORK
accessComplexity: MEDIUM
authentication: NONE
confidentialityImpact: PARTIAL
integrityImpact: PARTIAL
availabilityImpact: PARTIAL
exploitabilityScore: 8.6
impactScore: 6.4
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.0

VULHUB: VHN-376452
severity: MEDIUM
baseScore: 6.8
vectorString: AV:N/AC:M/AU:N/C:P/I:P/A:P
accessVector: NETWORK
accessComplexity: MEDIUM
authentication: NONE
confidentialityImpact: PARTIAL
integrityImpact: PARTIAL
availabilityImpact: PARTIAL
exploitabilityScore: 8.6
impactScore: 6.4
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.1

nvd@nist.gov: CVE-2021-1792
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: REQUIRED
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.1

Trust: 1.0

ZDI: CVE-2021-1792
baseSeverity: LOW
baseScore: 3.3
vectorString: AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: REQUIRED
scope: UNCHANGED
confidentialityImpact: LOW
integrityImpact: NONE
availabilityImpact: NONE
exploitabilityScore: 1.8
impactScore: 1.4
version: 3.0

Trust: 0.7

sources: ZDI: ZDI-21-148 // VULHUB: VHN-376452 // CNNVD: CNNVD-202102-078 // NVD: CVE-2021-1792

PROBLEMTYPE DATA

problemtype:CWE-125

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sources: VULHUB: VHN-376452 // NVD: CVE-2021-1792

THREAT TYPE

remote

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sources: CNNVD: CNNVD-202102-078

TYPE

buffer error

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sources: CNNVD: CNNVD-202102-078

EXPLOIT AVAILABILITY

sources:
            
            
            VULHUB: VHN-376452

PATCH
title:Apple has issued an update to correct this vulnerability.url:https://support.apple.com/en-us/HT212147
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title:Apple CoreText Remediation of resource management error vulnerabilitiesurl:http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=140651
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sources:
            
            
            ZDI: ZDI-21-148 // 
            
            
            
            CNNVD: CNNVD-202102-078

EXTERNAL IDS
db:NVDid:CVE-2021-1792
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db:PACKETSTORMid:161247
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db:ZDI_CANid:ZDI-CAN-12754
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db:ZDIid:ZDI-21-148
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db:AUSCERTid:ESB-2021.0354
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db:CNNVDid:CNNVD-202102-078
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db:PACKETSTORMid:161248
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db:VULHUBid:VHN-376452
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db:VULMONid:CVE-2021-1792
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sources:
            
            
            ZDI: ZDI-21-148 // 
            
            
            
            VULHUB: VHN-376452 // 
            
            
            
            VULMON: CVE-2021-1792 // 
            
            
            
            PACKETSTORM: 161248 // 
            
            
            
            PACKETSTORM: 161247 // 
            
            
            
            CNNVD: CNNVD-202102-078 // 
            
            
            
            NVD: CVE-2021-1792

REFERENCES
url:https://support.apple.com/en-us/ht212147
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url:https://support.apple.com/en-us/ht212146
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url:https://support.apple.com/en-us/ht212148
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url:https://support.apple.com/en-us/ht212149
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1792
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url:https://vigilance.fr/vulnerability/apple-macos-multiple-vulnerabilities-34452
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url:https://packetstormsecurity.com/files/161247/apple-security-advisory-2021-02-01-3.html
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url:https://www.auscert.org.au/bulletins/esb-2021.0354/
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1789
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1760
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1766
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1783
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1787
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1757
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1785
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1769
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1761
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1744
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1748
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1764
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1773
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1776
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1791
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1778
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url:https://www.apple.com/support/security/pgp/
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1786
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1772
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1743
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1758
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1782
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1788
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1750
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1746
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1747
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1741
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url:https://exchange.xforce.ibmcloud.com/vulnerabilities/195890
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1793
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url:https://support.apple.com/ht212148.
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url:https://nvd.nist.gov/vuln/detail/cve-2021-1759
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url:https://support.apple.com/ht212149.
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sources:
            
            
            ZDI: ZDI-21-148 // 
            
            
            
            VULHUB: VHN-376452 // 
            
            
            
            VULMON: CVE-2021-1792 // 
            
            
            
            PACKETSTORM: 161248 // 
            
            
            
            PACKETSTORM: 161247 // 
            
            
            
            CNNVD: CNNVD-202102-078 // 
            
            
            
            NVD: CVE-2021-1792

CREDITS
Apple
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sources:
            
            
            PACKETSTORM: 161248 // 
            
            
            
            PACKETSTORM: 161247 // 
            
            
            
            CNNVD: CNNVD-202102-078

SOURCES
db:ZDIid:ZDI-21-148
db:VULHUBid:VHN-376452
db:VULMONid:CVE-2021-1792
db:PACKETSTORMid:161248
db:PACKETSTORMid:161247
db:CNNVDid:CNNVD-202102-078
db:NVDid:CVE-2021-1792

LAST UPDATE DATE
2024-08-14T12:41:09.527000+00:00

SOURCES UPDATE DATE
db:ZDIid:ZDI-21-148date:2021-02-04T00:00:00
db:VULHUBid:VHN-376452date:2021-04-09T00:00:00
db:VULMONid:CVE-2021-1792date:2021-04-09T00:00:00
db:CNNVDid:CNNVD-202102-078date:2021-04-12T00:00:00
db:NVDid:CVE-2021-1792date:2021-04-09T22:18:01.573

SOURCES RELEASE DATE
db:ZDIid:ZDI-21-148date:2021-02-04T00:00:00
db:VULHUBid:VHN-376452date:2021-04-02T00:00:00
db:VULMONid:CVE-2021-1792date:2021-04-02T00:00:00
db:PACKETSTORMid:161248date:2021-02-02T16:09:50
db:PACKETSTORMid:161247date:2021-02-02T16:08:52
db:CNNVDid:CNNVD-202102-078date:2021-02-02T00:00:00
db:NVDid:CVE-2021-1792date:2021-04-02T18:15:21.873