SB2019072932 - OS Command Injection in exim (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) OS Command Injection (CVE-ID: CVE-2019-13917)

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

The vulnerability exists due to insufficient filtering of user-supplied data under certain conditions, e.g. if your configuration uses the ${sort } expansion. A remote unauthenticated attacker can send a specially crafted email, modify $local_part or $domain items, inject 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 however requires non-default exim configuration.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=10f6d6b57c1bc6978981bb5bba137cf9e32d1a79
• https://git.alpinelinux.org/aports/commit/?id=4e307ad47d11f989e230d577f19c1dab3286a9e9
• https://git.alpinelinux.org/aports/commit/?id=cb34e53649ad688804bbd0cf2707f90ad2533511