3.3 Low
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
7.1 High
AI Score
Confidence
Low
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
39.7%
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
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update libsepol to update your system.
New Packages:
aarch64:
libsepol-2.5-10.amzn2.0.1.aarch64
libsepol-devel-2.5-10.amzn2.0.1.aarch64
libsepol-static-2.5-10.amzn2.0.1.aarch64
libsepol-debuginfo-2.5-10.amzn2.0.1.aarch64
i686:
libsepol-2.5-10.amzn2.0.1.i686
libsepol-devel-2.5-10.amzn2.0.1.i686
libsepol-static-2.5-10.amzn2.0.1.i686
libsepol-debuginfo-2.5-10.amzn2.0.1.i686
src:
libsepol-2.5-10.amzn2.0.1.src
x86_64:
libsepol-2.5-10.amzn2.0.1.x86_64
libsepol-devel-2.5-10.amzn2.0.1.x86_64
libsepol-static-2.5-10.amzn2.0.1.x86_64
libsepol-debuginfo-2.5-10.amzn2.0.1.x86_64
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
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | libsepol | < 2.5-10.amzn2.0.1 | libsepol-2.5-10.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | libsepol-devel | < 2.5-10.amzn2.0.1 | libsepol-devel-2.5-10.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | libsepol-static | < 2.5-10.amzn2.0.1 | libsepol-static-2.5-10.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | libsepol-debuginfo | < 2.5-10.amzn2.0.1 | libsepol-debuginfo-2.5-10.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | i686 | libsepol | < 2.5-10.amzn2.0.1 | libsepol-2.5-10.amzn2.0.1.i686.rpm |
Amazon Linux | 2 | i686 | libsepol-devel | < 2.5-10.amzn2.0.1 | libsepol-devel-2.5-10.amzn2.0.1.i686.rpm |
Amazon Linux | 2 | i686 | libsepol-static | < 2.5-10.amzn2.0.1 | libsepol-static-2.5-10.amzn2.0.1.i686.rpm |
Amazon Linux | 2 | i686 | libsepol-debuginfo | < 2.5-10.amzn2.0.1 | libsepol-debuginfo-2.5-10.amzn2.0.1.i686.rpm |
Amazon Linux | 2 | x86_64 | libsepol | < 2.5-10.amzn2.0.1 | libsepol-2.5-10.amzn2.0.1.x86_64.rpm |
Amazon Linux | 2 | x86_64 | libsepol-devel | < 2.5-10.amzn2.0.1 | libsepol-devel-2.5-10.amzn2.0.1.x86_64.rpm |
3.3 Low
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
7.1 High
AI Score
Confidence
Low
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
39.7%