#VU32859 Permissions, Privileges, and Access Controls in Postfix - CVE-2011-0411

Vulnerability identifier: #VU32859

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-0411

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Postfix
Server applications / Mail servers

Vendor: Postfix.org

Description

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

The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Postfix: 2.4.0 - 2.4.15

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External links
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
https://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
https://lists.fedoraproject.org/pipermail/package-announce/2011-March/056559.html
https://lists.fedoraproject.org/pipermail/package-announce/2011-March/056560.html
https://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
https://secunia.com/advisories/43646
https://secunia.com/advisories/43874
https://security.gentoo.org/glsa/glsa-201206-33.xml
https://securitytracker.com/id?1025179
https://support.apple.com/kb/HT5002
https://www.debian.org/security/2011/dsa-2233
https://www.kb.cert.org/vuls/id/555316
https://www.kb.cert.org/vuls/id/MORO-8ELH6Z
https://www.oracle.com/technetwork/topics/security/cpuapr2011-301950.html
https://www.osvdb.org/71021
https://www.postfix.org/CVE-2011-0411.html
https://www.redhat.com/support/errata/RHSA-2011-0422.html
https://www.redhat.com/support/errata/RHSA-2011-0423.html
https://www.securityfocus.com/bid/46767
https://www.vupen.com/english/advisories/2011/0611
https://www.vupen.com/english/advisories/2011/0752
https://www.vupen.com/english/advisories/2011/0891
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932

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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.