CVE-2021-30465

NameCVE-2021-30465
Descriptionrunc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
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 severitymedium
Debian Bugs988768

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
runc (PTS)stretch0.1.1+dfsg1-2+deb9u1vulnerable
stretch (security)0.1.1+dfsg1-2+deb9u2vulnerable
buster1.0.0~rc6+dfsg1-3vulnerable
bullseye, sid1.0.0~rc93+ds1-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
runcsource(unstable)1.0.0~rc93+ds1-5988768

Notes

https://www.openwall.com/lists/oss-security/2021/05/19/2
https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r
Initial patch in -4, but revised patch was applied only in -5

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