CVE-2020-10702

Description

A flaw was found in QEMU in the implementation of the Pointer Authentication (PAuth) support for ARM introduced in version 4.0 and fixed in version 5.0.0. A general failure of the signature generation process caused every PAuth-enforced pointer to be signed with the same signature. A local attacker could obtain the signature of a protected pointer and abuse this flaw to bypass PAuth protection for all programs running on QEMU.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.04%• Percentile: 11%

Techniques & Countermeasures

• CWE-325•Missing Cryptographic Step

  The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.

Affected Systems

• qemu•qemu

  ≥ 4.0.0, < 5.0.0

• the qemu project•qemu

  ≥ 4.0.0, < 5.0.0

References (3)

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10702
• https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=de0b1bae6461f67243282555475f88b2384a1eb9
• https://security.netapp.com/advisory/ntap-20200724-0007/