There’s an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14309
Reference (s):
- https://security.netapp.com/advisory/ntap-20200731-0008/
- GENTOO:GLSA-202104-05
- URL: https://security.gentoo.org/glsa/202104-05
- https://bugzilla.redhat.com/show_bug.cgi?id=1852022
- URL: https://bugzilla.redhat.com/show_bug.cgi?id=1852022