Improper Verification of Cryptographic Signature in QEMU - CVE-2020-10702

Vulnerability identifier: #VU28198

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-10702

CWE-ID: CWE-347

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass authentication.

The vulnerability exists due to usage of a weak signature algorithm within the /arm/pauth_helper.c in Pointer Authentication support for ARM. A local user can bypass PAuth and gain unauthorized access to resources on the system.

QEMU
qemu (Ubuntu package)
qemu
qemu-debuginfo
qemu-debugsource
qemu-guest-agent
qemu-help
qemu-img
qemu-seabios
openEuler

Install updates from vendor's website.

QEMU - update to 5.0.0
qemu (Ubuntu package) - addressed in versions 1:2.5+dfsg-5ubuntu10.44, 1:2.11+dfsg-1ubuntu7.26, 1:4.0+dfsg-0ubuntu9.6, 1:4.2-3ubuntu6.1
qemu - update to 4.1.0-18
qemu-debuginfo - update to 4.1.0-18
qemu-debugsource - update to 4.1.0-18
qemu-guest-agent - update to 4.1.0-18
qemu-help - update to 4.1.0-18
qemu-img - update to 4.1.0-18
qemu-seabios - update to 4.1.0-18

• https://usn.ubuntu.com/4372-1/
• https://security-tracker.debian.org/tracker/CVE-2020-10702
• https://bugs.launchpad.net/qemu/+bug/1859713
• https://git.qemu.org/?p=qemu.git;a=commit;h=de0b1bae6461f67243282555475f88b2384a1eb9

• Authentication bypass in QEMU
• Ubuntu update for QEMU
• openEuler 20.03 LTS update for qemu