Stack-based Buffer Overflow Affecting shim-ia32 package, versions <0:15.4-2.el8_5.2.rocky


Severity

Recommended
0.0
medium
0
10

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-ROCKY8-SHIMIA32-3215456
  • published5 Jan 2023
  • disclosed3 Mar 2021

Introduced: 3 Mar 2021

CVE-2020-27749  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 shim-ia32 to version 0:15.4-2.el8_5.2.rocky or higher.
This issue was patched in RLSA-2021:1734.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-ia32 package and not the shim-ia32 package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS Base Scores

version 3.1