[DSE-Dev] Bug#990526: libsepol: CVE-2021-36084 CVE-2021-36085 CVE-2021-36086 CVE-2021-36087

[Moritz Mühlenhoff]

Source: libsepol
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerabilities were published for libsepol.

CVE-2021-36084[0]:
| The CIL compiler in SELinux 3.2 has a use-after-free in
| __cil_verify_classperms (called from __cil_verify_classpermission and
| __cil_pre_verify_helper).

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065
https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yaml

CVE-2021-36085[1]:
| The CIL compiler in SELinux 3.2 has a use-after-free in
| __cil_verify_classperms (called from __verify_map_perm_classperms and
| hashtab_map).

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31124a
https://github.com/SELinuxProject/selinux/commit/2d35fcc7e9e976a2346b1de20e54f8663e8a6cba
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-421.yaml

CVE-2021-36086[2]:
| The CIL compiler in SELinux 3.2 has a use-after-free in
| cil_reset_classpermission (called from cil_reset_classperms_set and
| cil_reset_classperms_list).

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32177
https://github.com/SELinuxProject/selinux/commit/c49a8ea09501ad66e799ea41b8154b6770fec2c8
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-536.yaml

CVE-2021-36087[3]:
| The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in
| ebitmap_match_any (called indirectly from cil_check_neverallow). NOTE:
| bad0a746e9f4cf260dedba5828d9645d50176aac is cited in the OSV "fixed"
| field but does not have a code change.

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675
https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml

	
If you fix the vulnerabilities please also make sure to include the
CVE (Common Vulnerabilities & Exposures) ids in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-36084
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36084
[1] https://security-tracker.debian.org/tracker/CVE-2021-36085
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36085
[2] https://security-tracker.debian.org/tracker/CVE-2021-36086
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36086
[3] https://security-tracker.debian.org/tracker/CVE-2021-36087
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36087

Please adjust the affected versions in the BTS as needed.