The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2023:0067 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-33643:
    An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an     calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

    CVE-2021-33644:
    An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an     calling of malloc(0) for a variable gnu_longname, causing an out-of-bounds read.

    CVE-2021-33645:
    The th_read() function doesnt free a variable t->th_buf.gnu_longlink after allocating memory, which may     cause a memory leak.

    CVE-2021-33646:
    The th_read() function doesnt free a variable t->th_buf.gnu_longname after allocating memory, which may     cause a memory leak.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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.

An update of the libtar package has been released.

The remote Fedora 36 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2022-ccc68b06cc advisory.

    - fix use-after-free bugs introduced by incorrect memleak fixes (CVE-2021-33640)


Tenable has extracted the preceding description block directly from the Fedora 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 a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:2898 advisory.

    The libtar packages contain a C library for manipulating tar archives. The library supports both the     strict POSIX tar format and many of the commonly used GNU extensions.

    Security Fix(es):

    * libtar: out-of-bounds read in gnu_longlink (CVE-2021-33643)

    * libtar: out-of-bounds read in gnu_longname (CVE-2021-33644)

    * libtar: memory leak found in th_read() function (CVE-2021-33645)

    * libtar: memory leak found in th_read() function (CVE-2021-33646)

    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 8.8 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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-054040 advisory.

    The th_read() function doesnt free a variable t->th_buf.gnu_longname after allocating memory, which may     cause a memory leak.

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

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
236098	Alibaba Cloud Linux 3 : 0067: libtar (ALINUX3-SA-2023:0067)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	critical
332509	Photon OS 5.0: Libtar PHSA-2023-5.0-90-0010	Nessus	PhotonOS Local Security Checks	2026/8/5	2026/11/2	critical
169344	Fedora 36 : libtar (2022-ccc68b06cc)	Nessus	Fedora Local Security Checks	2022/12/28	2024/11/14	critical
175902	RHEL 8 : libtar (RHSA-2023:2898)	Nessus	Red Hat Local Security Checks	2023/5/17	2024/11/7	critical
349031	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libtar (UTSA-2026-054040)	Nessus	Unity Linux Local Security Checks	2026/9/22	2026/9/22	high
332324	Photon OS 5.0: Libtar PHSA-2023-5.0-91-0010	Nessus	PhotonOS Local Security Checks	2026/8/5	2026/11/2	critical
203367	Photon OS 4.0: Libtar PHSA-2022-4.0-0231	Nessus	PhotonOS Local Security Checks	2024/7/23	2026/11/2	critical

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