| Name | CVE-2021-36087 |
| Description | The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in ebitmap_match_any (called indirectly from cil_check_neverallow). This occurs because there is sometimes a lack of checks for invalid statements in an optional block. |
| 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-3930-1, ELA-1209-1 |
| Debian Bugs | 990526 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libsepol (PTS) | jessie | 2.3-2 | fixed |
| stretch (lts), stretch | 2.6-2+deb9u1 | fixed |
| buster, buster (lts) | 2.8-1+deb10u1 | fixed |
| bullseye | 3.1-1 | vulnerable |
| bullseye (security) | 3.1-1+deb11u1 | fixed |
| bookworm | 3.4-2.1 | fixed |
| sid, trixie | 3.7-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[buster] - libsepol <no-dsa> (Minor issue)
[stretch] - libsepol <no-dsa> (Minor issue)
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675
https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521 (3.3-rc1)
https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac (3.3-rc1)
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml
[jessie] - libsepol <not-affected> (CIL support added in 2.4)