Zero-day vulnerability in Oracle Solaris

Improper input validation
CVE-2020-14871

According to FireEye, the vulnerability is being exploited in the wild by the actor tracked as UNC1945.

Vulnerability details

Advisory: SB2020102303 - Multiple vulnerabilities in Oracle Solaris

Vulnerable component: Oracle Solaris

CVE-ID: CVE-2020-14871

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-20 - Improper input validation

Description:

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The vulnerability exists due to improper input validation within the Pluggable authentication module (PAM) component in Oracle Solaris. A remote non-authenticated attacker can exploit this vulnerability to execute arbitrary code.

Note, this vulnerability is being actively exploited in the wild.

Public Exploits:

- Solaris SunSSH 11.0 x86 - libpam Remote Root (2) [Exploit-DB]

- Solaris SunSSH 11.0 x86 - libpam Remote Root (3) [Exploit-DB]

- Solaris SunSSH 11.0 x86 - libpam Remote Root [Exploit-DB]

External links:

https://www.fireeye.com/blog/threat-research/2020/11/live-off-the-land-an-overview-of-unc1945.html

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.