ID

VAR-201904-1477

CVE

CVE-2018-4363

TITLE

plural Apple Product input validation vulnerability

DESCRIPTION

An input validation issue existed in the kernel. This issue was addressed with improved input validation. This issue affected versions prior to iOS 12, tvOS 12, watchOS 5. Both Apple iOS and tvOS are products of Apple Inc. in the United States. Apple iOS is an operating system developed for mobile devices. Kernel is one of the kernel components. tvOS is a smart TV operating system. An attacker can exploit this vulnerability to read restricted memory. iOS kernel stack memory disclosure due to failure to check copyin return value CVE-2018-4363 Here's a code snippet from sleh.c with the second level exception handler for undefined instruction exceptions: static void handle_uncategorized(arm_saved_state_t *state, boolean_t instrLen2) { exception_type_t exception = EXC_BAD_INSTRUCTION; mach_exception_data_type_t codes[2] = {EXC_ARM_UNDEFINED}; mach_msg_type_number_t numcodes = 2; uint32_t instr; <------ (a) if (instrLen2) { uint16_t instr16; COPYIN(get_saved_state_pc(state), (char *)&instr16, sizeof(instr16)); instr = instr16; } else { COPYIN(get_saved_state_pc(state), (char *)&instr, sizeof(instr)); <------- (b) } .... else { codes[1] = instr; <------ (c) } } exception_triage(exception, codes, numcodes); <-------- (d) At (a) the uint32_t instr is declared uninitialized on the stack. At (b) the code tries to copyin the bytes of the exception-causing instruction from userspace note that the COPYIN macro doesn't itself check the return value of copyin, it just calls it. At (c) instr is assigned to codes[1], which at (d) is passed to exception_triage. that codes array will eventually end up being sent in an exception mach message. The bug is that we can force copyin to fail by unmapping the page containing the undefined instruction while it's being handled. (I tried to do this with XO memory but the kernel seems to be able to copyin that just fine.) This PoC has an undefined instruction (0xdeadbeef) on its own page and spins up a thread to keep switching the protection of that page between VM_PROT_NONE and VM_PROT_READ|VM_PROT_EXECUTE. We then keep spinning up threads which try to execute that undefined instruction. If the race windows align the thread executes the undefined instruction but when the sleh code tries to copyin the page is unmapped, the copying fails and the exception message we get has stale stack memory. This PoC just demonstrates that you do get values which aren't 0xdeadbeef in there for the EXC_ARM_UNDEFINED type. You'd have to do a bit more fiddling to work out how to get something specific there. Note that there are lots of other unchecked COPYIN's in sleh.c (eg when userspace tries to access a system register not allowed for EL0) and these seem to have the same issue. tested on iPod Touch 6g running 11.3.1, but looking at the kernelcache it seems to still be there in iOS 12. Found by: ianbeer . CVE-2018-4322: Min (Spark) Zheng, Xiaolong Bai of Alibaba Inc. Bluetooth Available for: iPhone SE, iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, iPad Mini 4, 12.9-inch iPad Pro 1st generation, 12.9-inch iPad Pro 2nd generation, 10.5-inch iPad Pro, 9.7-inch iPad Pro, iPad 5th generation, and iPod Touch 6th generation Impact: An attacker in a privileged network position may be able to intercept Bluetooth traffic Description: An input validation issue existed in Bluetooth. CVE-2018-4329: Hugo S. CVE-2018-4338: Lee @ SECLAB, Yonsei University working with Trend Micro's Zero Day Initiative Installation note: This update is available through iTunes and Software Update on your iOS device, and will not appear in your computer's Software Update application, or in the Apple Downloads site. Make sure you have an Internet connection and have installed the latest version of iTunes from https://www.apple.com/itunes/ iTunes and Software Update on the device will automatically check Apple's update server on its weekly schedule. When an update is detected, it is downloaded and the option to be installed is presented to the user when the iOS device is docked. We recommend applying the update immediately if possible. Selecting Don't Install will present the option the next time you connect your iOS device. The automatic update process may take up to a week depending on the day that iTunes or the device checks for updates. You may manually obtain the update via the Check for Updates button within iTunes, or the Software Update on your device. To check that the iPhone, iPod touch, or iPad has been updated: * Navigate to Settings * Select General * Select About. WebKit We would like to acknowledge Cary Hartline, Hanming Zhang from 360 Vuclan team, and Zach Malone of CA Technologies for their assistance. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 APPLE-SA-2018-10-30-10 Additional information for APPLE-SA-2018-9-24-5 watchOS 5 watchOS 5 addresses the following: CFNetwork Available for: Apple Watch Series 1 and later 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-2018-4126: Bruno Keith (@bkth_) working with Trend Micro's Zero Day Initiative Entry added October 30, 2018 CoreFoundation Available for: Apple Watch Series 1 and later Impact: A malicious application may be able to elevate privileges Description: A memory corruption issue was addressed with improved input validation. CVE-2018-4412: The UK's National Cyber Security Centre (NCSC) Entry added October 30, 2018 CoreFoundation Available for: Apple Watch Series 1 and later Impact: An application may be able to gain elevated privileges Description: A memory corruption issue was addressed with improved input validation. CVE-2018-4414: The UK's National Cyber Security Centre (NCSC) Entry added October 30, 2018 CoreText Available for: Apple Watch Series 1 and later Impact: Processing a maliciously crafted text file may lead to arbitrary code execution Description: A use after free issue was addressed with improved memory management. CVE-2018-4347: an anonymous researcher Entry added October 30, 2018 Grand Central Dispatch Available for: Apple Watch Series 1 and later 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-2018-4426: Brandon Azad Entry added October 30, 2018 Heimdal Available for: Apple Watch Series 1 and later 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-2018-4331: Brandon Azad CVE-2018-4332: Brandon Azad CVE-2018-4343: Brandon Azad Entry added October 30, 2018 IOHIDFamily Available for: Apple Watch Series 1 and later Impact: A malicious application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed with improved input validation CVE-2018-4408: Ian Beer of Google Project Zero Entry added October 30, 2018 IOKit Available for: Apple Watch Series 1 and later Impact: A malicious application may be able to break out of its sandbox Description: A memory corruption issue was addressed with improved memory handling. CVE-2018-4341: Ian Beer of Google Project Zero CVE-2018-4354: Ian Beer of Google Project Zero Entry added October 30, 2018 IOKit Available for: Apple Watch Series 1 and later Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed with improved state management. CVE-2018-4383: Apple Entry added October 30, 2018 IOUserEthernet Available for: Apple Watch Series 1 and later 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-2018-4401: Apple Entry added October 30, 2018 iTunes Store Available for: Apple Watch Series 1 and later Impact: An attacker in a privileged network position may be able to spoof password prompts in the iTunes Store Description: An input validation issue was addressed with improved input validation. CVE-2018-4305: Jerry Decime Kernel Available for: Apple Watch Series 1 and later Impact: A malicious application may be able to leak sensitive user information Description: An access issue existed with privileged API calls. CVE-2018-4399: Fabiano Anemone (@anoane) Entry added October 30, 2018 Kernel Available for: Apple Watch Series 1 and later 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-2018-4336: Brandon Azad CVE-2018-4337: Ian Beer of Google Project Zero CVE-2018-4340: Mohamed Ghannam (@_simo36) CVE-2018-4344: The UK's National Cyber Security Centre (NCSC) CVE-2018-4425: cc working with Trend Micro's Zero Day Initiative, Juwei Lin (@panicaII) of Trend Micro working with Trend Micro's Zero Day Initiative Entry added October 30, 2018 Kernel Available for: Apple Watch Series 1 and later Impact: An application may be able to read restricted memory Description: An input validation issue existed in the kernel. CVE-2018-4363: Ian Beer of Google Project Zero Kernel Available for: Apple Watch Series 1 and later Impact: An attacker in a privileged network position may be able to execute arbitrary code Description: A memory corruption issue was addressed with improved validation. CVE-2018-4407: Kevin Backhouse of Semmle Ltd. Entry added October 30, 2018 Safari Available for: Apple Watch Series 1 and later Impact: A local user may be able to discover websites a user has visited Description: A consistency issue existed in the handling of application snapshots. CVE-2018-4313: 11 anonymous researchers, David Scott, Enes Mert Ulu of Abdullah MA1/4rAide AzA1/4nenek Anadolu Lisesi - Ankara/TA1/4rkiye, Mehmet Ferit DaAtan of Van YA1/4zA1/4ncA1/4 YA+-l University, Metin Altug Karakaya of Kaliptus Medical Organization, Vinodh Swami of Western Governor's University (WGU) Security Available for: Apple Watch Series 1 and later Impact: A local user may be able to cause a denial of service Description: This issue was addressed with improved checks. CVE-2018-4395: Patrick Wardle of Digita Security Entry added October 30, 2018 Security Available for: Apple Watch Series 1 and later Impact: An attacker may be able to exploit weaknesses in the RC4 cryptographic algorithm Description: This issue was addressed by removing RC4. CVE-2016-1777: Pepi Zawodsky Symptom Framework Available for: Apple Watch Series 1 and later Impact: An application may be able to read restricted memory Description: An out-of-bounds read was addressed with improved bounds checking. CVE-2018-4203: Bruno Keith (@bkth_) working with Trend Micro's Zero Day Initiative Entry added October 30, 2018 Text Available for: Apple Watch Series 1 and later Impact: Processing a maliciously crafted text file may lead to a denial of service Description: A denial of service issue was addressed with improved validation. CVE-2018-4304: jianan.huang (@Sevck) Entry added October 30, 2018 WebKit Available for: Apple Watch Series 1 and later Impact: Unexpected interaction causes an ASSERT failure Description: A memory corruption issue was addressed with improved validation. CVE-2018-4191: found by OSS-Fuzz WebKit Available for: Apple Watch Series 1 and later Impact: Cross-origin SecurityErrors includes the accessed frame's origin Description: The issue was addressed by removing origin information. CVE-2018-4311: Erling Alf Ellingsen (@steike) WebKit Available for: Apple Watch Series 1 and later Impact: Processing maliciously crafted web content may lead to arbitrary code execution Description: Multiple memory corruption issues were addressed with improved memory handling. CVE-2018-4299: Samuel GroI2 (saelo) working with Trend Micro's Zero Day Initiative CVE-2018-4358: @phoenhex team (@bkth_ @5aelo @_niklasb) working with Trend Micro's Zero Day Initiative CVE-2018-4359: Samuel GroA (@5aelo) WebKit Available for: Apple Watch Series 1 and later Impact: A malicious website may cause unexepected cross-origin behavior Description: A cross-origin issue existed with "iframe" elements. CVE-2018-4319: John Pettitt of Google WebKit Available for: Apple Watch Series 1 and later Impact: Unexpected interaction causes an ASSERT failure Description: A memory consumption issue was addressed with improved memory handling. CVE-2018-4361: found by OSS-Fuzz Additional recognition Core Data We would like to acknowledge Andreas Kurtz (@aykay) of NESO Security Labs GmbH for their assistance. Kernel We would like to acknowledge Brandon Azad for their assistance. Sandbox Profiles We would like to acknowledge Tencent Keen Security Lab working with Trend Micro's Zero Day Initiative for their assistance. SQLite We would like to acknowledge Andreas Kurtz (@aykay) of NESO Security Labs GmbH for their assistance. WebKit We would like to acknowledge Tencent Keen Security Lab working with Trend Micro's Zero Day Initiative 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----- iQJdBAEBCABHFiEEDNXJVNCJJEAVmJdZeC9tht7TK3EFAlvYkgUpHHByb2R1Y3Qt c2VjdXJpdHktbm9yZXBseUBsaXN0cy5hcHBsZS5jb20ACgkQeC9tht7TK3GbihAA rJrGRlOECVnj/z6kzobQ6SjqeXQanrEJKOEbP12pOEgOcqhJd/CsRIGMGxtG8cRC H60/qGsVtDXhqmGZQl2cBaMeg+bagLvSaRUC6urXqYLIKoGay7zsbQyWS4hAbyNu Gpu0k5bvb2tr3IZIfqHfUcScxpsB3zJiYejtgLow2MDbkt84qNqx73xYbOIXDJoc kfyNhb/RKqiXOi5Yvh+E84GARjUSGUFD5fMbIMu7Lf0cwGpL3XakKG8S+8L0W3/W vGsl7V8DWeH6qbVoMkLUxWGxWzCd4bUr88J0cybski3L4SvpYbDPMMKxQkyn4Rfq qSDG3RMS0MUeoGn/iwRcJ8p6gPMGjWTT+lvX0XaZzG3b/mkOw8C2jRs1Ds8vUbRB Pxn1AQvg0x+EW/HIKqrvbE6i5pLjhurHYChy9tI9AS2iSHsAnrSB8DV8mc4T4v6a zJqJO5qPPCVJ9K328l+FyXe+X5erQP4/dwol71VjweA/peSJCL34/YL3oSs9e41R ApabYVIphnq0Ion5gVNancPhgQEbkIjMncFiGRg4wF0jly2Ni+NsnDquTKEM3VvG mOlo0VVw3XxLhtiQF/RKbQSy+6dK0YGykIsmnz/DsstxS4xRiWbk75XErA/nSwPs fHAicxI2AmpI+PbdYcPI4D3eJr/1ZDH8NvY1897WX5c= =fz+z -----END PGP SIGNATURE-----

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

input validation error

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Apple

SOURCES

LAST UPDATE DATE

2024-11-23T20:34:13.079000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE