| Name | CVE-2023-40548 |
| Description | A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3813-1 |
| Debian Bugs | 1061519 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| shim (PTS) | bullseye | 15.7-1~deb11u1 | vulnerable |
| trixie, bookworm | 15.7-1 | vulnerable |
| sid | 15.8-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| shim | source | buster | 15.8-1~deb10u1 | | DLA-3813-1 | |
| shim | source | (unstable) | 15.8-1 | | | 1061519 |
Notes
[bookworm] - shim <no-dsa> (Minor issue, fix with a point release)
[bullseye] - shim <no-dsa> (Minor issue, fix with a point release)
https://bugzilla.redhat.com/show_bug.cgi?id=2241782
https://github.com/rhboot/shim/commit/96dccc255b16e9465dbee50b3cef6b3db74d11c8 (15.8)