CVE-2015-3245 — Incomplete blacklist vulnerability in the chfn function in libuser before 0

Incomplete blacklist vulnerability in the chfn function in libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, allows local users to cause a denial of service (/etc/passwd corruption) via a newline character in the GECOS fie

01What is this vulnerability?

Incomplete blacklist vulnerability in the chfn function in libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, allows local users to cause a denial of service (/etc/passwd corruption) via a newline character in the GECOS field.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

08Timeline

• Published: 2015-08-11T14:00:00.000Z
• Last modified: 2024-08-06T05:39:32.007Z

09References

• lists.fedoraproject.org — http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162947.html
• www.exploit-db.com — https://www.exploit-db.com/exploits/44633/
• access.redhat.com — https://access.redhat.com/articles/1537873
• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2015-1482.html
• lists.fedoraproject.org — http://lists.fedoraproject.org/pipermail/package-announce/2015-August/163044.htm…
• www.qualys.com — https://www.qualys.com/2015/07/23/cve-2015-3245-cve-2015-3246/cve-2015-3245-cve-…
• www.securitytracker.com — http://www.securitytracker.com/id/1033040
• www.securityfocus.com — http://www.securityfocus.com/bid/76021
• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2015-1483.html