Input validation error in fetchmail.berlios.de Fetchmail

1) Input validation error

EUVDB-ID: #VU33934

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-3482

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

Fetchmail 5.0.8 through 6.3.21, when using NTLM authentication in debug mode, allows remote NTLM servers to (1) cause a denial of service (crash and delayed delivery of inbound mail) via a crafted NTLM response that triggers an out-of-bounds read in the base64 decoder, or (2) obtain sensitive information from memory via an NTLM Type 2 message with a crafted Target Name structure, which triggers an out-of-bounds read.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Fetchmail: 5.0.8 - 6.3.21

External links

http://lists.fedoraproject.org/pipermail/package-announce/2012-October/088836.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-October/088871.html
http://seclists.org/oss-sec/2012/q3/230
http://seclists.org/oss-sec/2012/q3/232
http://www.fetchmail.info/fetchmail-SA-2012-02.txt
http://www.securityfocus.com/bid/54987
http://blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_fetchmail

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 trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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