Buffer overflow in Red Hat Bootloader Team Shim
CVE-2022-28737
There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not discarded in such scenario.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (25.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Red Hat Bootloader Team Shim — versions 0
- Redhat Shim
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (mailing-list, Mailing List, Third Party Advisory)
- security@ubuntu.com (issue-tracking, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-28737?
- CVE-2022-28737 is a medium-severity vulnerability in Red Hat Bootloader Team Shim, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2023-07-20.
- How severe is CVE-2022-28737?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2022-28737 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.