CVE-2021-36087

2021-07-0100:00:00

ubuntu.com

3.3 Low

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

0.001 Low

EPSS

Percentile

29.7%

JSON

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.

Bugs

Notes

Author	Note
sbeattie	AppArmor is the default LSM in Ubuntu, issue only affects compilation of selinux policy trusty version predates the introduction of CIL

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlibsepol< 2.7-1ubuntu0.1UNKNOWN
ubuntu20.04noarchlibsepol< 3.0-1ubuntu0.1UNKNOWN
ubuntu21.10noarchlibsepol< 3.1-1ubuntu2.1UNKNOWN
ubuntu16.04noarchlibsepol< 2.4-2ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	libsepol	< 2.7-1ubuntu0.1	UNKNOWN
ubuntu	20.04	noarch	libsepol	< 3.0-1ubuntu0.1	UNKNOWN
ubuntu	21.10	noarch	libsepol	< 3.1-1ubuntu2.1	UNKNOWN
ubuntu	16.04	noarch	libsepol	< 2.4-2ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN