Buffer overflow in Postfix

1) Buffer overflow

EUVDB-ID: #VU45044

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-2011-1720

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The SMTP server in Postfix before 2.5.13, 2.6.x before 2.6.10, 2.7.x before 2.7.4, and 2.8.x before 2.8.3, when certain Cyrus SASL authentication methods are enabled, does not create a new server handle after client authentication fails, which allows remote attackers to cause a denial of service (heap memory corruption and daemon crash) or possibly execute arbitrary code via an invalid AUTH command with one method followed by an AUTH command with a different method.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Postfix: 2.0.0 - 2.8.2

CPE2.3

• cpe:2.3:a:postfix_org:postfix:2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:postfix_org:postfix:2.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:postfix_org:postfix:2.0.2:*:*:*:*:*:*:*

External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00002.html
http://secunia.com/advisories/44500
http://security.gentoo.org/glsa/glsa-201206-33.xml
http://securityreason.com/securityalert/8247
http://www.debian.org/security/2011/dsa-2233
http://www.kb.cert.org/vuls/id/727230
http://www.mail-archive.com/postfix-announce@postfix.org/msg00007.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:090
http://www.osvdb.org/72259
http://www.postfix.org/announcements/postfix-2.8.3.html
http://www.postfix.org/CVE-2011-1720.html
http://www.securityfocus.com/archive/1/517917/100/0/threaded
http://www.securityfocus.com/bid/47778
http://www.securitytracker.com/id?1025521
http://www.ubuntu.com/usn/usn-1131-1
http://bugzilla.redhat.com/show_bug.cgi?id=699035
http://exchange.xforce.ibmcloud.com/vulnerabilities/67359

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.