#VU56093 Out-of-bounds read in libfetch - CVE-2021-36159

Vulnerability identifier: #VU56093

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-36159

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libfetch
Other software / Other software solutions

Vendor: cvsweb.netbsd.org

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when handling numeric strings for the FTP and HTTP protocols in strtol. A remote attacker can pass specially crafted input to the application, trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libfetch: before 2021-07-26

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External links
https://gitlab.alpinelinux.org/alpine/apk-tools/-/issues/10749
https://github.com/freebsd/freebsd-src/commits/main/lib/libfetch

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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.