Vulnerability identifier: #VU45025

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1929

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dovecot
Server applications / Mail servers

Vendor: Dovecot

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

lib-mail/message-header-parser.c in Dovecot 1.2.x before 1.2.17 and 2.0.x before 2.0.13 does not properly handle '' characters in header names, which allows remote attackers to cause a denial of service (daemon crash or mailbox corruption) via a crafted e-mail message.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Dovecot: 1.2.0 - 2.0.12

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External links
http://dovecot.org/pipermail/dovecot/2011-May/059085.html
http://dovecot.org/pipermail/dovecot/2011-May/059086.html
http://hg.dovecot.org/dovecot-1.1/rev/3698dfe0f21c
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061384.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060815.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060825.html
http://openwall.com/lists/oss-security/2011/05/18/4
http://openwall.com/lists/oss-security/2011/05/19/3
http://openwall.com/lists/oss-security/2011/05/19/6
http://osvdb.org/72495
http://secunia.com/advisories/44683
http://secunia.com/advisories/44712
http://secunia.com/advisories/44756
http://secunia.com/advisories/44771
http://secunia.com/advisories/44827
http://www.debian.org/security/2011/dsa-2252
http://www.dovecot.org/doc/NEWS-1.2
http://www.dovecot.org/doc/NEWS-2.0
http://www.mandriva.com/security/advisories?name=MDVSA-2011:101
http://www.redhat.com/support/errata/RHSA-2011-1187.html
http://www.securityfocus.com/bid/47930
http://www.ubuntu.com/usn/USN-1143-1
http://bugzilla.redhat.com/show_bug.cgi?id=706286
http://exchange.xforce.ibmcloud.com/vulnerabilities/67589
http://hermes.opensuse.org/messages/8581790

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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.