DescriptionGNU screen before 4.5.1 allows local users to modify arbitrary files and consequently gain root privileges by leveraging improper checking of logfile permissions.
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 severityhigh
Debian Bugs852484

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
screen (PTS)stretch4.5.0-6fixed
bullseye, sid4.8.0-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
screensourcejessie(not affected)
screensourcestretch(not affected)
screensourcewheezy(not affected)


[stretch] - screen <not-affected> (Vulnerable code not present/never migrated to stretch)
[jessie] - screen <not-affected> (Vulnerable code not present)
[wheezy] - screen <not-affected> (Vulnerable code not present)
Introduced in (screen-v4):
Introduced in (master):

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