OS Command Injection in Exim - CVE-2019-15846

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to incorrect processing of trailing backslash during TLS connection. A remote unauthenticated attacker can send specially crafted command via an established TLS connection and execute arbitrary OS commands on the target system with root privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

How to mitigate CVE-2019-15846

Sources

• http://exim.org/static/doc/security/CVE-2019-15846.txt
• http://www.openwall.com/lists/oss-security/2019/09/06/2
• https://seclists.org/bugtraq/2019/Sep/13
• https://www.openwall.com/lists/oss-security/2019/09/06/1