ID

VAR-201710-0450

CVE

CVE-2017-14494

TITLE

Dnsmasq contains multiple vulnerabilities

DESCRIPTION

dnsmasq before 2.78, when configured as a relay, allows remote attackers to obtain sensitive memory information via vectors involving handling DHCPv6 forwarded requests. Dnsmasq versions 2.77 and earlier contains multiple vulnerabilities. dnsmasq Contains an information disclosure vulnerability.Information may be obtained. Attackers can exploit these issues to execute arbitrary code within the context of the affected application, bypass the ASLR, gain sensitive information, or cause a denial-of-service condition. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Critical: dnsmasq security update Advisory ID: RHSA-2017:2836-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:2836 Issue date: 2017-10-02 CVE Names: CVE-2017-14491 CVE-2017-14492 CVE-2017-14493 CVE-2017-14494 CVE-2017-14495 CVE-2017-14496 ===================================================================== 1. Summary: An update for dnsmasq is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server. Security Fix(es): * A heap buffer overflow was found in dnsmasq in the code responsible for building DNS replies. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. (CVE-2017-14491) * A heap buffer overflow was discovered in dnsmasq in the IPv6 router advertisement (RA) handling code. An attacker on the local network segment could send crafted RAs to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. This issue only affected configurations using one of these options: enable-ra, ra-only, slaac, ra-names, ra-advrouter, or ra-stateless. (CVE-2017-14492) * A stack buffer overflow was found in dnsmasq in the DHCPv6 code. An attacker on the local network could send a crafted DHCPv6 request to dnsmasq which would cause it to a crash or, potentially, execute arbitrary code. (CVE-2017-14493) * An information leak was found in dnsmasq in the DHCPv6 relay code. An attacker on the local network could send crafted DHCPv6 packets to dnsmasq causing it to forward the contents of process memory, potentially leaking sensitive data. (CVE-2017-14494) * A memory exhaustion flaw was found in dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets which would trigger memory allocations which would never be freed, leading to unbounded memory consumption and eventually a crash. This issue only affected configurations using one of the options: add-mac, add-cpe-id, or add-subnet. (CVE-2017-14495) * An integer underflow flaw leading to a buffer over-read was found in dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash. This issue only affected configurations using one of the options: add-mac, add-cpe-id, or add-subnet. (CVE-2017-14496) Red Hat would like to thank Felix Wilhelm (Google Security Team), Fermin J. Serna (Google Security Team), Gabriel Campana (Google Security Team), Kevin Hamacher (Google Security Team), and Ron Bowes (Google Security Team) for reporting these issues. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1495409 - CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DNS replies 1495410 - CVE-2017-14492 dnsmasq: heap overflow in the IPv6 router advertisement code 1495411 - CVE-2017-14493 dnsmasq: stack buffer overflow in the DHCPv6 code 1495412 - CVE-2017-14494 dnsmasq: information leak in the DHCPv6 relay code 1495415 - CVE-2017-14495 dnsmasq: memory exhaustion vulnerability in the EDNS0 code 1495416 - CVE-2017-14496 dnsmasq: integer underflow leading to buffer over-read in the EDNS0 code 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: dnsmasq-2.76-2.el7_4.2.src.rpm x86_64: dnsmasq-2.76-2.el7_4.2.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: dnsmasq-2.76-2.el7_4.2.src.rpm x86_64: dnsmasq-2.76-2.el7_4.2.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: dnsmasq-2.76-2.el7_4.2.src.rpm aarch64: dnsmasq-2.76-2.el7_4.2.aarch64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.aarch64.rpm ppc64: dnsmasq-2.76-2.el7_4.2.ppc64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.ppc64.rpm ppc64le: dnsmasq-2.76-2.el7_4.2.ppc64le.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.ppc64le.rpm s390x: dnsmasq-2.76-2.el7_4.2.s390x.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.s390x.rpm x86_64: dnsmasq-2.76-2.el7_4.2.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): aarch64: dnsmasq-debuginfo-2.76-2.el7_4.2.aarch64.rpm dnsmasq-utils-2.76-2.el7_4.2.aarch64.rpm ppc64: dnsmasq-debuginfo-2.76-2.el7_4.2.ppc64.rpm dnsmasq-utils-2.76-2.el7_4.2.ppc64.rpm ppc64le: dnsmasq-debuginfo-2.76-2.el7_4.2.ppc64le.rpm dnsmasq-utils-2.76-2.el7_4.2.ppc64le.rpm s390x: dnsmasq-debuginfo-2.76-2.el7_4.2.s390x.rpm dnsmasq-utils-2.76-2.el7_4.2.s390x.rpm x86_64: dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: dnsmasq-2.76-2.el7_4.2.src.rpm x86_64: dnsmasq-2.76-2.el7_4.2.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2017-14491 https://access.redhat.com/security/cve/CVE-2017-14492 https://access.redhat.com/security/cve/CVE-2017-14493 https://access.redhat.com/security/cve/CVE-2017-14494 https://access.redhat.com/security/cve/CVE-2017-14495 https://access.redhat.com/security/cve/CVE-2017-14496 https://access.redhat.com/security/updates/classification/#critical https://access.redhat.com/security/vulnerabilities/3199382 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZ0opYXlSAg2UNWIIRAr0dAJ9rIL1FgNTJUf2I9jjKFFlfkCd/kwCfV+bX SfoCV7+qG2nwqlHKLZOlhIU= =iWfU -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . =========================================================================== Ubuntu Security Notice USN-3430-3 January 04, 2018 dnsmasq regression =========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM Summary: USN-3430-2 introduced regression in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: USN-3430-2 fixed several vulnerabilities. The update introduced a new regression that breaks DNS resolution. This update addresses the problem. We apologize for the inconvenience. Original advisory details: Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. (CVE-2017-14491) Felix Wilhelm, Fermin J. (CVE-2017-14492) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DHCPv6 requests. (CVE-2017-14493) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DHCPv6 packets. (CVE-2017-14494) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. A remote attacker could use this issue to cause Dnsmasq to consume memory, resulting in a denial of service. (CVE-2017-14495) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service. (CVE-2017-14496) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: dnsmasq=C2=A02.59-4ubuntu0.4 dnsmasq-base2.59-4ubuntu0.4 dnsmasq-utils2.59-4ubuntu0.4 After a standard system update you need to reboot your computer to make all the necessary changes. 7.3) - ppc64, ppc64le, s390x, x86_64 3. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201710-27 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Dnsmasq: Multiple vulnerabilities Date: October 23, 2017 Bugs: #632692 ID: 201710-27 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been found in Dnsmasq, the worst of which may allow remote attackers to execute arbitrary code. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/dnsmasq < 2.78 >= 2.78 Description =========== Multiple vulnerabilities have been discovered in Dnsmasq. Workaround ========== There is no known workaround at this time. Resolution ========== All Dnsmasq users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.78" References ========== [ 1 ] CVE-2017-14491 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14491 [ 2 ] CVE-2017-14492 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14492 [ 3 ] CVE-2017-14493 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14493 [ 4 ] CVE-2017-14494 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14494 [ 5 ] CVE-2017-14495 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14495 [ 6 ] CVE-2017-14496 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-14496 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201710-27 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2017 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote or local

TYPE

information disclosure

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Gabriel Campana, Kevin Hamacher and Ron Bowes of the Google Security Team,Felix Wilhelm, Fermin J. Serna

SOURCES

LAST UPDATE DATE

2024-11-23T21:15:44.653000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE