Ubuntu update for pure-ftpd

1) Access of Uninitialized Pointer

EUVDB-ID: #VU25651

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-9274

CWE-ID: CWE-824 - Access of Uninitialized Pointer

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to access to an uninitialized pointer in init_aliases() function in diraliases.c when processing liked. A remote user with ability to create aliases can crash the server.

Mitigation

Update the affected package pure-ftpd to the latest version.

Vulnerable software versions

Ubuntu: 16.04

pure-ftpd-postgresql (Ubuntu package): before 1.0.36-3.2+deb8u1build0.16.04.1

pure-ftpd-mysql (Ubuntu package): before 1.0.36-3.2+deb8u1build0.16.04.1

pure-ftpd-ldap (Ubuntu package): before 1.0.36-3.2+deb8u1build0.16.04.1

pure-ftpd-common (Ubuntu package): before 1.0.36-3.2+deb8u1build0.16.04.1

pure-ftpd (Ubuntu package): before 1.0.36-3.2+deb8u1build0.16.04.1

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:pure-ftpd-postgresql_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:pure-ftpd-mysql_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:pure-ftpd-ldap_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:pure-ftpd-common_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:pure-ftpd_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4515-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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