Improper access control in QEMU - CVE-2019-13164

Vulnerability identifier: #VU19054

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-13164

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to qemu-bridge-helper.c does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size. A local attacker can create a tap device and attach it to a denied bridge interface, bypass the Access Control List (ACL) and get access to confidential data transmitted on the bridge.

QEMU
Gentoo Linux
Ubuntu
Opensuse
qemu-utils (Ubuntu package)
qemu-kvm (Ubuntu package)
qemu-system-x86 (Ubuntu package)
qemu-user-static (Ubuntu package)
qemu-system-common (Ubuntu package)
qemu-common (Ubuntu package)
qemu (Ubuntu package)
qemu (Debian package)

Install update from vendor's website.

QEMU - update to 4.0.1
qemu-utils (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu-kvm (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu-system-x86 (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu-user-static (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu-system-common (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu-common (Ubuntu package) - update to 2.0.0+dfsg-2ubuntu1.47
qemu (Ubuntu package) - addressed in versions 2.0.0+dfsg-2ubuntu1.47, 1:2.5+dfsg-5ubuntu10.42, 1:2.11+dfsg-1ubuntu7.20, 1:3.1+dfsg-2ubuntu3.6, 1:4.0+dfsg-0ubuntu9.1
qemu (Debian package) - addressed in versions 1:2.8+dfsg-6+deb9u8, 1:3.1+dfsg-8+deb10u2

• http://www.openwall.com/lists/oss-security/2019/07/02/2
• https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg00145.html

• Security restrictions bypass in QEMU
• Debian update for qemu
• OpenSUSE Linux update for qemu
• OpenSUSE Linux update for qemu
• Debian update for qemu
• Ubuntu update for QEMU
• Gentoo update for QEMU
• Ubuntu update for qemu