#VU51703 OS Command Injection in SpamAssassin - CVE-2020-1946

Vulnerability identifier: #VU51703

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-1946

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SpamAssassin
Server applications / DLP, anti-spam, sniffers

Vendor: Apache Foundation

Description

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

The vulnerability exists due to improper input validation when processing rule configuration (.cf) files. A remote authenticated attacker trick the victim use a specially crafted rule configuration file and execute arbitrary OS commands on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SpamAssassin: 3.0.0 - 3.4.4

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External links
https://mail-archives.apache.org/mod_mbox/spamassassin-announce/202103.mbox/%3C241c47dc-467f-c622-c8ab-e06df159b475%40apache.org%3E

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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.