CVE-2019-13164

Publication date 3 July 2019

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

From the Ubuntu Security Team

Riccardo Schirone discovered that the QEMU bridge helper did not properly validate network interface names. A local attacker could possibly use this to bypass ACL restrictions.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	19.10 eoan	Fixed 1:4.0+dfsg-0ubuntu9.1
	19.04 disco	Fixed 1:3.1+dfsg-2ubuntu3.6
	18.10 cosmic	Ignored
	18.04 LTS bionic	Fixed 1:2.11+dfsg-1ubuntu7.20
	16.04 LTS xenial	Fixed 1:2.5+dfsg-5ubuntu10.42
	14.04 LTS trusty	Fixed 2.0.0+dfsg-2ubuntu1.47 Ubuntu Pro
qemu-kvm	19.10 eoan	Not in release
	19.04 disco	Not in release
	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

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Notes

sbeattie

qemu-bridge-helper.c does not exist in precise's qemu package

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
qemu	Upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=6f5d8671225dc77190647f18a27a0d156d4ca97a

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H