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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2022-030 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3930 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3930-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Sean Whitton     October 22, 2024                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libsepol     Version        : 3.1-1+deb11u1     CVE ID         : CVE-2021-36084 CVE-2021-36085 CVE-2021-36086 CVE-2021-36087     Debian Bug     : 990526

    Multiple vulnerabilities were discovered in libsepol, a set of userspace     utilities and libraries for manipulating SELinux policies.

    CVE-2021-36084, CVE-2021-36085, CVE-2021-36086

        Three use-after-free problems were discovered in the CIL compiler.
        These could lead to data corruption, denial of service or possibly         arbitrary code execution.

    CVE-2021-36087

        A heap-based buffer over-read was discovered in the CIL compiler.
        This could lead to confidentiality or integrity violations, or         crashes.

    For Debian 11 bullseye, these problems have been fixed in version     3.1-1+deb11u1.

    We recommend that you upgrade your libsepol packages.

    For the detailed security status of libsepol please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libsepol

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 6.02, has libsepol packages installed that are affected by multiple vulnerabilities:

  - 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)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:4513 advisory.

  - 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)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libsepol installed on the remote host is prior to 2.5-10. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2307 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libsepol installed on the remote host is prior to 2.5-10. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2SELINUX-NG-2023-001 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-017 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2022-208 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libsepol package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2022-170 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5391-1 advisory.

    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. (CVE-2021-36084)

    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. (CVE-2021-36085)

    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. This issue only affects Ubuntu 18.04 LTS,

    Ubuntu 20.04 LTS and Ubuntu 21.10. (CVE-2021-36086)

    It was discovered that libsepol incorrectly validated certain data, leading to a heap overflow. An     attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2021-36087)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libsepol package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:4513 advisory.

  - 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)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4513 advisory.

    [2.9-3]
    - cil: Fix out-of-bound read of file context pattern ending with '\'
    - cil: Destroy classperms list when resetting classpermission (#1983517)
    - cil: Destroy classperm list when resetting map perms (#1983521)
    - cil: cil_reset_classperms_set() should not reset classpermission (#1983525)
    - cil: Set class field to NULL when resetting struct cil_classperms
    - cil: More strict verification of constraint leaf expressions
    - cil: Exit with an error if declaration name is a reserved word
    - cil: Allow permission expressions when using map classes
    - cil: Reorder checks for invalid rules when building AST
    - cil: Cleanup build AST helper functions
    - cil: Create new first child helper function for building AST
    - cil: Remove unused field from struct cil_args_resolve
    - cil: Destroy disabled optional blocks after pass is complete
    - cil: Check if name is a macro parameter first
    - cil: fix NULL pointer dereference in __cil_insert_name
    - cil: Report disabling an optional block only at high verbose levels
    - cil: Use AST to track blocks and optionals when resolving
    - cil: Reorder checks for invalid rules when resolving AST
    - cil: Sync checks for invalid rules in booleanifs
    - cil: Check for statements not allowed in optional blocks (#1983530)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4513 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:4513 advisory.

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
212463	Amazon Linux 2022 : libsepol, libsepol-devel, libsepol-static (ALAS2022-2022-030)	Nessus	Amazon Linux Local Security Checks	low
209513	Debian dla-3930 : libsepol1 - security update	Nessus	Debian Local Security Checks	low
206837	NewStart CGSL MAIN 6.02 : libsepol Multiple Vulnerabilities (NS-SA-2024-0054)	Nessus	NewStart CGSL Local Security Checks	low
196756	RHEL 7 : libsepol (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	low
184738	Rocky Linux 8 : libsepol (RLSA-2021:4513)	Nessus	Rocky Linux Local Security Checks	low
183473	Amazon Linux 2 : libsepol (ALAS-2023-2307)	Nessus	Amazon Linux Local Security Checks	low
182026	Amazon Linux 2 : libsepol (ALASSELINUX-NG-2023-001)	Nessus	Amazon Linux Local Security Checks	low
173096	Amazon Linux 2023 : libsepol, libsepol-devel, libsepol-static (ALAS2023-2023-017)	Nessus	Amazon Linux Local Security Checks	low
170591	Amazon Linux 2022 : libsepol, libsepol-devel, libsepol-static (ALAS2022-2022-208)	Nessus	Amazon Linux Local Security Checks	low
170502	EulerOS Virtualization 2.10.0 : libsepol (EulerOS-SA-2022-1405)	Nessus	Huawei Local Security Checks	low
166992	Amazon Linux 2022 : libsepol, libsepol-devel, libsepol-static (ALAS2022-2022-170)	Nessus	Amazon Linux Local Security Checks	low
160233	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : libsepol vulnerabilities (USN-5391-1)	Nessus	Ubuntu Local Security Checks	low
159869	EulerOS Virtualization 2.10.1 : libsepol (EulerOS-SA-2022-1379)	Nessus	Huawei Local Security Checks	low
158548	EulerOS 2.0 SP9 : libsepol (EulerOS-SA-2022-1293)	Nessus	Huawei Local Security Checks	low
158535	EulerOS 2.0 SP9 : libsepol (EulerOS-SA-2022-1309)	Nessus	Huawei Local Security Checks	low
158411	EulerOS 2.0 SP10 : libsepol (EulerOS-SA-2022-1245)	Nessus	Huawei Local Security Checks	low
158378	EulerOS 2.0 SP10 : libsepol (EulerOS-SA-2022-1257)	Nessus	Huawei Local Security Checks	low
157570	AlmaLinux 8 : libsepol (ALSA-2021:4513)	Nessus	Alma Linux Local Security Checks	low
155432	Oracle Linux 8 : libsepol (ELSA-2021-4513)	Nessus	Oracle Linux Local Security Checks	low
155202	RHEL 8 : libsepol (RHSA-2021:4513)	Nessus	Red Hat Local Security Checks	low
155077	CentOS 8 : libsepol (CESA-2021:4513)	Nessus	CentOS Local Security Checks	low

Detections

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CVE-2021-36087

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