CVE-2017-6998
Description
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "AVEVideoEncoder" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Apple iOS < 10.3.1 - Kernel
Sources:
https://github.com/doadam/ziVA
https://blog.zimperium.com/ziva-video-audio-ios-kernel-exploit/
ziVA
An iOS kernel exploit designated to work on all 64-bit iOS devices <= 10.3.1
More general information
https://blog.zimperium.com/zimperium-zlabs-ios-security-advisories/
https://blog.zimperium.com/ziva-video-audio-ios-kernel-exploit/
Offsets modifications for other iOS devices
Like a lot (if not most) of the iOS kernel exploits, this also requires offsets for each iOS device and version. Those will be posted in the close future (when I get more time) but should be acquired from AppleAVEDriver (you can get a hint on the offsets from the comments above them).
Sandbox escape
Like mentioned, AppleAVEDriver direct access requires sandbox escape (either mediaserverd sandbox context or no sandbox at all). Fortunately, Sandbox escape exploits have been released by P0, which means this can be used to completely compromise a kernel, and a step towards a full jailbreak.
Is it a Jailbreak?
This is a crucial part in a Jailbreak chain, but this never aimed to become a Jailbreak.
Is this going to be a jailbreak?
Maybe, if someone wants to work on that
Credits
Credit for finding the vulnerabilities, chaining them together, writing the exploit go to Adam Donenfeld (@doadam). Special thanks to Zuk Avraham (@ihackbanme), Yaniv Karta (@shokoluv) and the rest of the Zimperium team for the opportunity (and the paycheck).
Proof of Concept:
https://github.com/doadam/ziVA
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42555.zip
OS impact
macOS Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
References
- http://www.securityfocus.com/bid/98571
- https://support.apple.com/HT207798
- https://support.apple.com/HT207800
- https://support.apple.com/HT207801
- https://www.exploit-db.com/exploits/42555/
- http://www.securityfocus.com/bid/98571
- https://support.apple.com/HT207798
- https://support.apple.com/HT207800
- https://support.apple.com/HT207801
- https://www.exploit-db.com/exploits/42555/
CWEs
CWE-119
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.