Integer Overflow or Wraparound Affecting grub2-signed package, versions <1.34.22
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Test your applications- Snyk ID SNYK-UBUNTU1404-GRUB2SIGNED-596089
- published 29 Jul 2020
- disclosed 31 Jul 2020
Introduced: 29 Jul 2020
CVE-2020-14310 Open this link in a new tabHow to fix?
Upgrade Ubuntu:14.04 grub2-signed to version 1.34.22 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream grub2-signed package and not the grub2-signed package as distributed by Ubuntu.
See How to fix? for Ubuntu:14.04 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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2020-14310
- https://security-tracker.debian.org/tracker/CVE-2020-14310
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14310
- https://security.gentoo.org/glsa/202104-05
- 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/