Integer Overflow or Wraparound Affecting shim-ia32 package, versions <0:15-14.el8_2


Severity

0.0
medium
0
10

    Threat Intelligence

    EPSS
    0.05% (19th percentile)

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  • Snyk ID SNYK-CENTOS8-SHIMIA32-2043885
  • published 26 Jul 2021
  • disclosed 29 Jul 2020

How to fix?

Upgrade Centos:8 shim-ia32 to version 0:15-14.el8_2 or higher.

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 Centos. See How to fix? for Centos:8 relevant fixed versions and status.

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

CVSS Scores

version 3.1
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Snyk

5.7 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    High
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    High
  • Availability (A)
    High
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NVD

6 medium
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SUSE

5.7 medium
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Red Hat

5.7 medium