DescriptionIncomplete 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow
Debian Bugs793465

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libuser (PTS)buster, stretch1:0.62~dfsg-0.1fixed
bullseye, sid1:0.62~dfsg-0.3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[jessie] - libuser <no-dsa> (Minor issue)
initially attributed to usermode package, root-cause fixed in libuser instead

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