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Red Hat Enterprise Linux 8 RHSA-2021:4513-03 Security Alert: libsepol Issue

red hat
Calendar Grey November 9, 2021
Dist Redhat Esm H88
Red Hat issues a timely security patch for libsepol addressing potential buffer overflow issues and use-after-free vulnerabilities.
An update for libsepol is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

The libsepol library provides an API for the manipulation of SELinux binary policies. It is used by checkpolicy (the policy compiler) and similar tools, as well as by programs like load_policy that need to perform specific transformations on binary policies (for example, customizing policy boolean settings).
Security Fix(es):
* libsepol: use-after-free in __cil_verify_classperms() (CVE-2021-36084)
* libsepol: use-after-free in __cil_verify_classperms() (CVE-2021-36085)
* libsepol: use-after-free in cil_reset_classpermission() (CVE-2021-36086)
* libsepol: heap-based buffer overflow in ebitmap_match_any() (CVE-2021-36087)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory buffer overflow security fix Red Hat Enterprise Linux moderate impact use-after-free libsepol security

References

https://access.redhat.com/security/cve/CVE-2021-36084 https://access.redhat.com/security/cve/CVE-2021-36085 https://access.redhat.com/security/cve/CVE-2021-36086 https://access.redhat.com/security/cve/CVE-2021-36087 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/8.5_release_notes/index

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: libsepol-2.9-3.el8.src.rpm
aarch64: libsepol-2.9-3.el8.aarch64.rpm libsepol-debuginfo-2.9-3.el8.aarch64.rpm libsepol-debugsource-2.9-3.el8.aarch64.rpm libsepol-devel-2.9-3.el8.aarch64.rpm
ppc64le: libsepol-2.9-3.el8.ppc64le.rpm libsepol-debuginfo-2.9-3.el8.ppc64le.rpm libsepol-debugsource-2.9-3.el8.ppc64le.rpm libsepol-devel-2.9-3.el8.ppc64le.rpm
s390x: libsepol-2.9-3.el8.s390x.rpm libsepol-debuginfo-2.9-3.el8.s390x.rpm libsepol-debugsource-2.9-3.el8.s390x.rpm libsepol-devel-2.9-3.el8.s390x.rpm
x86_64: libsepol-2.9-3.el8.i686.rpm libsepol-2.9-3.el8.x86_64.rpm libsepol-debuginfo-2.9-3.el8.i686.rpm libsepol-debuginfo-2.9-3.el8.x86_64.rpm libsepol-debugsource-2.9-3.el8.i686.rpm libsepol-debugsource-2.9-3.el8.x86_64.rpm libsepol-devel-2.9-3.el8.i686.rpm libsepol-devel-2.9-3.el8.x86_64.rpm
Red Hat Enterprise Linux CRB (v. 8):
aarch64: libsepol-debuginfo-2.9-3.el8.aarch64.rpm libsepol-debugsource-2.9-3.el8.aarch64.rpm libsepol-static-2.9-3.el8.aarch64.rpm
ppc64le: libsepol-debuginfo-2.9-3.el8.ppc64le.rpm libsepol-debugsource-2.9-3.el8.ppc64le.rpm libsepol-static-2.9-3.el8.ppc64le.rpm
s390x: libsepol-debuginfo-2.9-3.el8.s390x.rpm libsepol-debugsource-2.9-3.el8.s390x.rpm libsepol-static-2.9-3.el8.s390x.rpm
x86_64:

Read the Full Advisory


Advisory ID: RHSA-2021:4513-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4513
Issue date: 2021-11-09

Topic

An update for libsepol is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory buffer overflow security fix Red Hat Enterprise Linux moderate impact use-after-free libsepol security

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux CRB (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1979662 - CVE-2021-36084 libsepol: use-after-free in __cil_verify_classperms()

1979664 - CVE-2021-36085 libsepol: use-after-free in __cil_verify_classperms()

1979666 - CVE-2021-36086 libsepol: use-after-free in cil_reset_classpermission()

1979668 - CVE-2021-36087 libsepol: heap-based buffer overflow in ebitmap_match_any()

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