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CVE-2021-36087

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5391-1
Posted Apr 27, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5391-1 - Nicolas Iooss discovered that libsepol incorrectly handled memory when handling policies. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. It was discovered that libsepol incorrectly handled memory when handling policies. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-36084, CVE-2021-36085, CVE-2021-36086, CVE-2021-36087
SHA-256 | 2b9f7839558bf9b6e3a4ce82cbaf448f90f226607ae4646b89d7394b329a6c7b
Red Hat Security Advisory 2021-4513-03
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4513-03 - The libsepol library provides an API for the manipulation of SELinux binary policies. It is used by checkpolicy and similar tools, as well as by programs like load_policy that need to perform specific transformations on binary policies. Issues addressed include buffer overflow and use-after-free vulnerabilities.

tags | advisory, overflow, vulnerability
systems | linux, redhat
advisories | CVE-2021-36084, CVE-2021-36085, CVE-2021-36086, CVE-2021-36087
SHA-256 | 723c79f7c2e2f7ecfab3483a6c8e832cb7b8b79beef456fe34c35e2810324945
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