CVE-2019-13164 — qemu-bridge-helper

qemu-bridge-helper.c in QEMU 3.1 and 4.0.0 does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size, which can lead to an ACL bypass.

01What is this vulnerability?

qemu-bridge-helper.c in QEMU 3.1 and 4.0.0 does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size, which can lead to an ACL bypass.

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: 2019-07-03T13:56:52.000Z
• Last modified: 2024-08-04T23:41:10.520Z

09References

• lists.gnu.org — https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg00145.html
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/07/02/2
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/07/02/2
• www.securityfocus.com — http://www.securityfocus.com/bid/109054
• seclists.org — https://seclists.org/bugtraq/2019/Aug/41
• www.debian.org — https://www.debian.org/security/2019/dsa-4506
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00000.html
• www.debian.org — https://www.debian.org/security/2019/dsa-4512
• seclists.org — https://seclists.org/bugtraq/2019/Sep/3
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00008.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html
• usn.ubuntu.com — https://usn.ubuntu.com/4191-2/
• usn.ubuntu.com — https://usn.ubuntu.com/4191-1/
• security.gentoo.org — https://security.gentoo.org/glsa/202003-66
• github.com — https://github.com/qemu/qemu/commit/03d7712b4bcd47bfe0fe14ba2fffa87e111fa086