Vulnerability identifier: #VU45039

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-2011-1407

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 DKIM implementation in Exim 4.7x before 4.76 permits matching for DKIM identities to apply to lookup items, instead of only strings, which allows remote attackers to execute arbitrary code or access a filesystem via a crafted identity.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Exim: 4.70 - 4.75

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External links
http://www.debian.org/security/2011/dsa-2236
http://www.securityfocus.com/bid/47836
http://www.ubuntu.com/usn/USN-1135-1
http://lists.exim.org/lurker/message/20110509.091632.daed0206.en.html
http://lists.exim.org/lurker/message/20110512.102909.8136175a.en.html

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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.