Integer Overflow or Wraparound Affecting shim-aa64 package, versions <0:15.8-4.el8_9


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.06% (29th percentile)

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  • Snyk ID SNYK-RHEL8-SHIMAA64-6189314
  • published 25 Jan 2024
  • disclosed 3 Oct 2023

How to fix?

Upgrade RHEL:8 shim-aa64 to version 0:15.8-4.el8_9 or higher.
This issue was patched in RHSA-2024:1902.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-aa64 package and not the shim-aa64 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

CVSS Scores

version 3.1
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NVD

7.4 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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Red Hat

6.2 medium
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SUSE

6.7 medium