| Name | CVE-2020-14311 |
| Description | There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4735-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| grub2 (PTS) | buster | 2.06-3~deb10u1 | fixed |
| buster (security) | 2.06-3~deb10u4 | fixed |
| bullseye | 2.06-3~deb11u5 | fixed |
| bullseye (security) | 2.06-3~deb11u4 | fixed |
| bookworm, trixie | 2.06-13 | fixed |
| sid | 2.12~rc1-11 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| grub2 | source | buster | 2.02+dfsg1-20+deb10u1 | | DSA-4735-1 | |
| grub2 | source | (unstable) | 2.04-9 | | | |
Notes
[stretch] - grub2 <ignored> (No SecureBoot support in stretch)
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=3f05d693d1274965ffbe4ba99080dc2c570944c6