After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).

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

  - After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in     the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the     released memory is used (use-after-free). (CVE-2021-33640)

  - 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-2021-33643)

  - 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_longname, causing an out-of-bounds read. (CVE-2021-33644)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longlink after allocating memory, which may     cause a memory leak. (CVE-2021-33645)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longname after allocating memory, which may     cause a memory leak. (CVE-2021-33646)

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.

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

  - After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in     the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the     released memory is used (use-after-free). (CVE-2021-33640)

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 version of libtar installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2021-33640 advisory.

  - After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in     the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the     released memory is used (use-after-free). (CVE-2021-33640)

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

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

  - After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in     the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the     released memory is used (use-after-free). (CVE-2021-33640)

  - 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-2021-33643)

  - 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_longname, causing an out-of-bounds read. (CVE-2021-33644)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longlink after allocating memory, which may     cause a memory leak. (CVE-2021-33645)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longname after allocating memory, which may     cause a memory leak. (CVE-2021-33646)

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

  - After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in     the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the     released memory is used (use-after-free). (CVE-2021-33640)

  - 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-2021-33643)

  - 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_longname, causing an out-of-bounds read. (CVE-2021-33644)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longlink after allocating memory, which may     cause a memory leak. (CVE-2021-33645)

  - The th_read() function doesn't free a variable t->th_buf.gnu_longname after allocating memory, which may     cause a memory leak. (CVE-2021-33646)

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	Severity
177207	EulerOS Virtualization 3.0.6.0 : libtar (EulerOS-SA-2023-2224)	Nessus	Huawei Local Security Checks	critical
173368	EulerOS 2.0 SP11 : libtar (EulerOS-SA-2023-1575)	Nessus	Huawei Local Security Checks	critical
173364	EulerOS 2.0 SP11 : libtar (EulerOS-SA-2023-1585)	Nessus	Huawei Local Security Checks	critical
172853	CBL Mariner 2.0 Security Update: libtar (CVE-2021-33640)	Nessus	MarinerOS Local Security Checks	critical
172714	EulerOS 2.0 SP10 : libtar (EulerOS-SA-2023-1554)	Nessus	Huawei Local Security Checks	critical
172709	EulerOS 2.0 SP10 : libtar (EulerOS-SA-2023-1529)	Nessus	Huawei Local Security Checks	critical
172304	EulerOS 2.0 SP9 : libtar (EulerOS-SA-2023-1473)	Nessus	Huawei Local Security Checks	critical
172283	EulerOS 2.0 SP9 : libtar (EulerOS-SA-2023-1448)	Nessus	Huawei Local Security Checks	critical
171144	EulerOS 2.0 SP8 : libtar (EulerOS-SA-2023-1324)	Nessus	Huawei Local Security Checks	critical
169344	Fedora 36 : libtar (2022-ccc68b06cc)	Nessus	Fedora Local Security Checks	critical

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CVE-2021-33640

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