ID

VAR-201710-1357

CVE

CVE-2017-7108

TITLE

plural Apple Product Wi-Fi Component vulnerable to arbitrary code execution in privileged context

DESCRIPTION

An issue was discovered in certain Apple products. iOS before 11 is affected. tvOS before 11 is affected. watchOS before 4 is affected. The issue involves the "Wi-Fi" component. It might allow remote attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via crafted Wi-Fi traffic. Apple iOS, WatchOS and tvOS are prone to multiple memory corruption and security-bypass vulnerabilities. Attackers can exploit these issues to execute arbitrary code and perform unauthorized actions. Failed exploit attempts may result in a denial-of-service condition. The following versions are affected: Versions prior to Apple iOS 11 Versions prior to Apple watchOS 4 Versions prior to Apple tvOS 11. in the United States. Apple iOS is an operating system developed for mobile devices; tvOS is a smart TV operating system; watchOS is a smart watch operating system. Apple: Heap overflow in "updateRateSetAsyncCallback" when handling ioctl results CVE-2017-7108 Broadcom produces Wi-Fi HardMAC SoCs which are used to handle the PHY and MAC layer processing. These chips are present in both mobile devices and Wi-Fi routers, and are capable of handling many Wi-Fi related events without delegating to the host OS. On iOS, the "AppleBCMWLANBusInterfacePCIe" driver is used in order to handle the PCIe interface and low-level communication protocols with the Wi-Fi SoC (also referred to as "dongle"). Similarly, the "AppleBCMWLANCore" driver handles the high-level protocols and the Wi-Fi configuration. Along with the regular flow of frames transferred between the host and the dongle, the two communicate with one another via a set of "ioctls" which can be issued to read or write dongle configuration from the host. This information is exchanged using the "Control Completion" ring, rather than the regular "RX" ring. When handling certain events, such as link status changes (indicated by the firmware-originated "WLC_E_LINK" event frame), the "AppleBCMWLANCore" driver updates the rate-set. This is done by issuing an asynchronous ioctl to the firwmare using the WLC_GET_CURR_RATESET (114) command code. Upon completion, this ioctl is handled by the "updateRateSetAsyncCallback" function, which performs the following high-level logic: int64_t updateRateSetAsyncCallback(void* this, ..., uint64_t error_code, void **ptr_to_result_struct) { void* result_buf = *ptr_to_result_struct; uint8_t results[0x14]; if (error_code) { //Handle error... } else if (result_buf) { memmove(results, results_buf, 0x14); save_rate_set((uint8_t*)this + 2196, results); ... } ... } void save_rate_set(void* this, uint8_t* rate_set_buffer) { uint32_t num_entries = *((uint32_t*)rate_set_buffer); *((uint16_t*)this + 2) = (uint16_t)num_entries; if (!num_entries) return; uint32_t* save_ptr = (uint32_t*)((uint8_t*)this + 16); uint8_t* rates_array = rate_set_buffer + sizeof(uint32_t); for (uint32_t i=0; i<num_entries; i++, save_ptr += 3) { save_ptr[-1] = rates_array[i] & 0x3F; save_ptr[0] = rates_array[i] >> 7; } } As can be seen above, both "updateRateSetAsyncCallback" and the helper function (named "save_rate_set" in the snippet above) make no attempts to validate the length field returned from the firmware in the ioctl response. As a result, an attacker controlling the firmware may choose an arbitrarily large value. Doing so will cause the copy loop in "save_rate_set" to copy data out-of-bounds into the buffer at (this + 2196). Note that the buffer's length is only 0xBC, but the attacker can cause arbitrarily many bytes to by copied. Since the data is copied from the stack buffer to which the ioctl's results were originally transferred, the OOB bytes will contain information from the stack, removing some degree of control over the copied contents. This bug is subject to a 90 day disclosure deadline. After 90 days elapse or a patch has been made broadly available, the bug report will become visible to the public. Found by: laginimaineb . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 APPLE-SA-2017-09-25-5 Additional information for APPLE-SA-2017-09-20-2 watchOS 4 watchOS 4 addresses the following: CFNetwork Proxies Available for: All Apple Watch models Impact: An attacker in a privileged network position may be able to cause a denial of service Description: Multiple denial of service issues were addressed through improved memory handling. CVE-2017-7083: Abhinav Bansal of Zscaler Inc. Entry added September 25, 2017 CoreAudio Available for: All Apple Watch models Impact: An application may be able to read restricted memory Description: An out-of-bounds read was addressed by updating to Opus version 1.1.4. CVE-2017-0381: V.E.O (@VYSEa) of Mobile Threat Research Team, Trend Micro Entry added September 25, 2017 Kernel Available for: All Apple Watch models Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed with improved memory handling. CVE-2017-7114: Alex Plaskett of MWR InfoSecurity Entry added September 25, 2017 libc Available for: All Apple Watch models Impact: A remote attacker may be able to cause a denial-of-service Description: A resource exhaustion issue in glob() was addressed through an improved algorithm. CVE-2017-7086: Russ Cox of Google Entry added September 25, 2017 libc Available for: All Apple Watch models Impact: An application may be able to cause a denial of service Description: A memory consumption issue was addressed through improved memory handling. CVE-2017-1000373 Entry added September 25, 2017 libexpat Available for: All Apple Watch models Impact: Multiple issues in expat Description: Multiple issues were addressed by updating to version 2.2.1 CVE-2016-9063 CVE-2017-9233 Entry added September 25, 2017 Security Available for: All Apple Watch models Impact: A revoked certificate may be trusted Description: A certificate validation issue existed in the handling of revocation data. This issue was addressed through improved validation. CVE-2017-7080: an anonymous researcher, Sven Driemecker of adesso mobile solutions gmbh, an anonymous researcher, Rune Darrud (@theflyingcorpse) of BA|rum kommune Entry added September 25, 2017 SQLite Available for: All Apple Watch models Impact: Multiple issues in SQLite Description: Multiple issues were addressed by updating to version 3.19.3. CVE-2017-10989: found by OSS-Fuzz CVE-2017-7128: found by OSS-Fuzz CVE-2017-7129: found by OSS-Fuzz CVE-2017-7130: found by OSS-Fuzz Entry added September 25, 2017 SQLite Available for: All Apple Watch models Impact: An application may be able to execute arbitrary code with system privileges Description: A memory corruption issue was addressed with improved memory handling. CVE-2017-7103: Gal Beniamini of Google Project Zero CVE-2017-7105: Gal Beniamini of Google Project Zero CVE-2017-7108: Gal Beniamini of Google Project Zero CVE-2017-7110: Gal Beniamini of Google Project Zero CVE-2017-7112: Gal Beniamini of Google Project Zero Wi-Fi Available for: All Apple Watch models Impact: Malicious code executing on the Wi-Fi chip may be able to read restricted kernel memory Description: A validation issue was addressed with improved input sanitization. CVE-2017-7116: Gal Beniamini of Google Project Zero zlib Available for: All Apple Watch models Impact: Multiple issues in zlib Description: Multiple issues were addressed by updating to version 1.2.11. CVE-2016-9840 CVE-2016-9841 CVE-2016-9842 CVE-2016-9843 Entry added September 25, 2017 Additional recognition Security We would like to acknowledge Abhinav Bansal of Zscaler, Inc. for their assistance. Installation note: Instructions on how to update your Apple Watch software are available at https://support.apple.com/kb/HT204641 To check the version on your Apple Watch, open the Apple Watch app on your iPhone and select "My Watch > General > About". Alternatively, on your watch, select "My Watch > General > About". Information will also be posted to the Apple Security Updates web site: https://support.apple.com/kb/HT201222 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----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJZyUQgAAoJEIOj74w0bLRGqL0QAIfT73f98ConKBEM8SMpm/g/ CtIS26bKtiSIniKWXjj0CHRcnFT4FPos5md2yNhBOTWIgChGtulnORWSowWu2RtI LVxqskUc97e6LLoTzFc8AM8q6b3Km2cx7C2iVNZWFrLO/JeDHfC8x2pMCgAT8Bx4 Q5FbDIGwD5+w+UYHgIVytqEPvt29OEwOBi41/f78Bvqj1oMf5+EQGjMFU+pECWGg zDucvK0iirv+5k5YcovpiQlaqx0QBPTMcaZJQLDY3t6k2RpdJZr5M7xd4Oanu0l1 E2blAl4CWN8zSQkdUfMdlamXYWwOvyv4b9iKb0+sKeLWHpWbaQ/LmOHuPHjvFgRq YWE72P3l5IVWSPZfgsUvD+70uHAobv70MB5O+TQnbLCemnwqq19psez8PMYR2fTF OfV0Dr6mpsa2GAVexNesEodlLz5a7kdjiBEAIUujJZzL8bVGdHjNll2qxHZCwlUW mWrxqot2QnymQ7Ycs1mGxg/97snO1eGT44BjVpQ47COSzI+YBhg2lLP15sGdRbF5 viCWhLkJGNBUN7naV/Jsj8sJNW0RBC1tkEz9cfRBLkU7ObtkJCORTwnmiz0jNzQf gvtVsBC+nBAlJA40Do1lB8rQw1yyizcUmckDywcJg7MatkwIymdgashIR/LVeBHR 39wnv7L2yjedzyd+/y5E =ACi9 -----END PGP SIGNATURE-----

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

buffer error

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Gal Beniamini of Google Project Zero

SOURCES

LAST UPDATE DATE

2024-11-23T19:55:29.079000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE