#VU23601 OS Command Injection in SpamAssassin - CVE-2018-11805

Vulnerability identifier: #VU23601

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-11805

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

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

Vendor: Apache Foundation

Description

The vulnerability allows a local user to execute arbitrary shell commands on the target system.

The vulnerability exists due to nefarious CF files can be configured to run system commands without any output. A local user can inject arbitrary commands into nefarious CF files and compromise the system or execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SpamAssassin: 3.4.0 - 3.4.2

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External links
https://www.openwall.com/lists/oss-security/2019/12/12/1
https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7647
https://lists.apache.org/thread.html/2946b38caec47f7f6a79e8e03d2aa723794186e59a7dc6b5e76dfc18@%3Cannounce.spamassassin.apache.org%3E
https://lists.apache.org/thread.html/6f89f82a573ea616dce53ec67e52d963618a9f9ac71da5c1efdbd166@%3Cusers.spamassassin.apache.org%3E
https://lists.apache.org/thread.html/bc58907171c6585e5875a3ce86066d4956c218911cb74e3156de4433@%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/d015dc5b4f24fd6777a85d068502a9c5d58d69d877ed5b0eb9a22cd5@%3Cdev.spamassassin.apache.org%3E
https://seclists.org/oss-sec/2019/q4/154
https://svn.apache.org/repos/asf/spamassassin/branches/3.4/build/announcements/3.4.3.txt

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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