CVE-2016-3697 — libcontainer/user/user

libcontainer/user/user.go in runC before 0.1.0, as used in Docker before 1.11.2, improperly treats a numeric UID as a potential username, which allows local users to gain privileges via a numeric username in the password file in a container.

01What is this vulnerability?

libcontainer/user/user.go in runC before 0.1.0, as used in Docker before 1.11.2, improperly treats a numeric UID as a potential username, which allows local users to gain privileges via a numeric username in the password file in a container.

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

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2016-06-01T20:00:00.000Z
• Last modified: 2024-08-06T00:03:34.441Z

09References

• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2016-1034.html
• github.com — https://github.com/opencontainers/runc/releases/tag/v0.1.0
• lists.opensuse.org — http://lists.opensuse.org/opensuse-updates/2016-05/msg00111.html
• github.com — https://github.com/docker/docker/issues/21436
• github.com — https://github.com/opencontainers/runc/pull/708
• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2016-2634.html
• github.com — https://github.com/opencontainers/runc/commit/69af385de62ea68e2e608335cffbb0f4aa…
• security.gentoo.org — https://security.gentoo.org/glsa/201612-28