Ubuntu update for apr

1) Out-of-bounds read

EUVDB-ID: #VU56059

Risk: Medium

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35940

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in the "apr_time_exp*()" functions. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.

Note, the vulnerability exists due to a missing patch for #VU9477 (CVE-2017-12613).

Mitigation

Update the affected package apr to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 21.04

libapr1 (Ubuntu package): before 1.7.0-6ubuntu0.1

External links

http://ubuntu.com/security/notices/USN-5056-1

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.