CVE-2021-36087
SELinux CIL Buffer Over-read Vulnerability
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.
INFO
Published Date :
July 1, 2021, 3:15 a.m.
Last Modified :
Nov. 7, 2023, 3:36 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
1.4
Exploitability Score :
1.8
Public PoC/Exploit Available at Github
CVE-2021-36087 has a 6 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-36087
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-36087.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
asp-net-core csharp docker dockerfile javascript react webapi docker-compose
C# Dockerfile HTML JavaScript CSS
None
TypeScript
Map Vulnerabilities into Different Layers of the Container Image
Python
None
Go
None
Java Shell
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-36087 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-36087 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ%40mail.gmail.com/T/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/ [No types assigned] Removed Reference MITRE https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ@mail.gmail.com/T/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/ -
Modified Analysis by [email protected]
Nov. 17, 2021
Action Type Old Value New Value Changed Reference Type https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521 No Types Assigned https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521 Patch, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/ Mailing List, Third Party Advisory Changed Reference Type https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ@mail.gmail.com/T/ No Types Assigned https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ@mail.gmail.com/T/ Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Nov. 15, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/ [No Types Assigned] -
CVE Modified by [email protected]
Jul. 26, 2021
Action Type Old Value New Value Changed 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). NOTE: bad0a746e9f4cf260dedba5828d9645d50176aac is cited in the OSV "fixed" field but does not have a code change. 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. Removed Reference https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac [Patch, Third Party Advisory] Added Reference https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ@mail.gmail.com/T/ [No Types Assigned] Added Reference https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521 [No Types Assigned] -
Reanalysis by [email protected]
Jul. 26, 2021
Action Type Old Value New Value Removed CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L -
Initial Analysis by [email protected]
Jul. 07, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675 No Types Assigned https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675 Exploit, Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml No Types Assigned https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml Third Party Advisory Changed Reference Type https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac No Types Assigned https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac Patch, Third Party Advisory Added CWE NIST CWE-125 Added CPE Configuration OR *cpe:2.3:o:selinux_project:selinux:3.2:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-36087 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-36087
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.07 }} 0.02%
score
0.29464
percentile