Vulnerability identifier: #VU41355

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-2957

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Exim
Server applications / Mail servers

Vendor: Exim

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The dmarc_process function in dmarc.c in Exim before 4.82.1, when EXPERIMENTAL_DMARC is enabled, allows remote attackers to execute arbitrary code via the From header in an email, which is passed to the expand_string function.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Exim: 4.00 - 4.80.1

---

External links
http://git.exim.org/exim.git/commitdiff/5b7a7c051c9ab9ee7c924a611f90ef2be03e0ad0
http://lists.exim.org/lurker/message/20140528.122536.a31d60a4.en.html

---

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.