ALAS2022-2022-030

Amazon Linux 2022 Security Advisory: ALAS-2022-030
Advisory Release Date: 2022-02-22 22:13 Pacific
Advisory Updated Date: 2022-02-25 20:37 Pacific
Severity: Medium
Issue Overview:

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). (CVE-2021-36084)

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). (CVE-2021-36085)

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). (CVE-2021-36086)

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. (CVE-2021-36087)


Affected Packages:

libsepol


Issue Correction:
Run dnf update --releasever=2022.0.20220222 libsepol to update your system.

New Packages:
aarch64:
    libsepol-debuginfo-3.3-2.amzn2022.aarch64
    libsepol-static-3.3-2.amzn2022.aarch64
    libsepol-3.3-2.amzn2022.aarch64
    libsepol-devel-3.3-2.amzn2022.aarch64
    libsepol-debugsource-3.3-2.amzn2022.aarch64

src:
    libsepol-3.3-2.amzn2022.src

x86_64:
    libsepol-debuginfo-3.3-2.amzn2022.x86_64
    libsepol-static-3.3-2.amzn2022.x86_64
    libsepol-3.3-2.amzn2022.x86_64
    libsepol-devel-3.3-2.amzn2022.x86_64
    libsepol-debugsource-3.3-2.amzn2022.x86_64

Additional References

Red Hat: CVE-2021-36084, CVE-2021-36085, CVE-2021-36086, CVE-2021-36087

Mitre: CVE-2021-36084, CVE-2021-36085, CVE-2021-36086, CVE-2021-36087