Input validation error in Exim

1) Input validation error

EUVDB-ID: #VU45039

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 - Improper input validation

Exploit availability: No

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

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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