Information disclosure in libfetch

1) Out-of-bounds read

EUVDB-ID: #VU56093

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36159

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

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

External links

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

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.