远程 Redhat Enterprise Linux 8 主机上安装的程序包受到 RHSA-2021:4513 公告中提及的多个漏洞的影响。

  - libsepol：__cil_verify_classperms() 中存在释放后使用问题（CVE-2021-36084、CVE-2021-36085）

  - libsepol：cil_reset_classpermission() 中存在释放后使用问题 (CVE-2021-36086)

  - libsepol：ebitmap_match_any() 中存在基于堆的缓冲区溢出问题 (CVE-2021-36087)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

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.

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 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.

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.

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 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.

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.

ID	Name	Product	Family	Published	Updated	Severity
155202	RHEL 8：libsepol (RHSA-2021:4513)	Nessus	Red Hat Local Security Checks	11/11/2021	11/7/2024	low
155077	CentOS 8 : libsepol (CESA-2021:4513)	Nessus	CentOS Local Security Checks	11/11/2021	11/24/2023	low
155202	RHEL 8 : libsepol (RHSA-2021:4513)	Nessus	Red Hat Local Security Checks	11/11/2021	11/7/2024	low
182026	Amazon Linux 2 : libsepol (ALASSELINUX-NG-2023-001)	Nessus	Amazon Linux Local Security Checks	9/27/2023	12/11/2024	low
158411	EulerOS 2.0 SP10 : libsepol (EulerOS-SA-2022-1245)	Nessus	Huawei Local Security Checks	2/25/2022	11/7/2023	low
158548	EulerOS 2.0 SP9 : libsepol (EulerOS-SA-2022-1293)	Nessus	Huawei Local Security Checks	3/2/2022	11/6/2023	low
212463	Amazon Linux 2022 : libsepol, libsepol-devel, libsepol-static (ALAS2022-2022-030)	Nessus	Amazon Linux Local Security Checks	12/11/2024	12/12/2024	low
206837	NewStart CGSL MAIN 6.02 : libsepol Multiple Vulnerabilities (NS-SA-2024-0054)	Nessus	NewStart CGSL Local Security Checks	9/10/2024	9/10/2024	low
209513	Debian dla-3930 : libsepol1 - security update	Nessus	Debian Local Security Checks	10/22/2024	10/22/2024	low

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