#VU52855 Security restrictins bypass in Exim - CVE-2020-28014

Vulnerability identifier: #VU52855

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-28014

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Exim
Server applications / Mail servers

Vendor: Exim

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application uses PID files in an insecure manner. A local user can predict the name of the PID file and use it to escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Exim: 4.00 - 4.94.1

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External links
https://seclists.org/oss-sec/2021/q2/91

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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.