CVE-2021-36087

low

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.

References

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675

https://lore.kernel.org/selinux/[email protected]om/T/

https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521

https://lists.fedoraproject.org/archives/list/[email protected]/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/

Details

Source: MITRE

Published: 2021-07-01

Updated: 2021-11-17

Type: CWE-125

Risk Information

CVSS v2

Base Score: 2.1

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 3.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Impact Score: 1.4

Exploitability Score: 1.8

Severity: LOW