CVE-2020-14331

NameCVE-2020-14331
DescriptionA flaw was found in the Linux kernel’s implementation of the invert video code on VGA consoles when a local attacker attempts to resize the console, calling an ioctl VT_RESIZE, which causes an out-of-bounds write to occur. This flaw allows a local user with access to the VGA console to crash the system, potentially escalating their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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)
ReferencesDLA-2385-1, DLA-2420-1
NVD severityhigh

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.240-2fixed
buster4.19.146-1fixed
buster (security)4.19.152-1fixed
bullseye, sid5.9.1-1fixed
linux-4.19 (PTS)stretch (security)4.19.152-1~deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.240-1DLA-2420-1
linuxsourcebuster4.19.146-1
linuxsource(unstable)5.7.17-1unimportant
linux-4.19sourcestretch4.19.146-1~deb9u1DLA-2385-1

Notes

https://www.openwall.com/lists/oss-security/2020/07/28/2
Only exploitable when CONFIG_VGACON_SOFT_SCROLLBACK is set

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