Integer Overflow or Wraparound Affecting shim-ia32 package, versions <0:15-14.el8_2
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Test your applications- 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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14310
- https://access.redhat.com/security/cve/CVE-2020-14310
- https://security.gentoo.org/glsa/202104-05
- https://access.redhat.com/errata/RHSA-2020:3216
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
- https://usn.ubuntu.com/4432-1/