Out-of-bounds read in libtpms - CVE-2021-3623

Vulnerability identifier: #VU54504

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-3623

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to crash the system.

The vulnerability exists due to a boundary condition. A local user can use specially-crafted TPM 2 command packets containing illegal values to trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

libtpms
Arch Linux
Fedora
openEuler
libtpms
libtpms-debugsource
libtpms-devel
libtpms-debuginfo

Install updates from vendor's website.

libtpms - addressed in versions 0.6.5, 0.7.8, 0.8.4
libtpms - update to 0.7.3-7
libtpms-debugsource - update to 0.7.3-7
libtpms-devel - update to 0.7.3-7
libtpms-debuginfo - update to 0.7.3-7
libtpms - addressed in versions 0.8.4-0.20210624gita594c4692a.el8.1, 0.8.4-1.20210624gita594c4692a.fc34.1

• https://bugzilla.redhat.com/show_bug.cgi?id=1976806

• Out-of-bounds read in libtpms
• Arch Linux update for libtpms
• openEuler update for libtpms
• Fedora 34 update for libtpms
• Fedora EPEL 8 update for libtpms