#VU55101 Link following in Archive_Tar - CVE-2021-32610

Vulnerability identifier: #VU55101

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-32610

CWE-ID: CWE-59

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Archive_Tar
Web applications / Other software

Vendor: PHP Group

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to the application does not check if the file in the archive is a symbolic link when extracting it. A remote attacker can pass a specially crafted file to the application and overwrite arbitrary files on the system. Successful exploitation of the vulnerability may allow an attacker to compromise the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Archive_Tar: 1.0 - 1.4.13

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External links
https://github.com/pear/Archive_Tar/releases/tag/1.4.14

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.