CVE-2011-0411 Security feature bypass in n/a

Medium 6.8 Published 16 Mar 2011 Updated 6 Aug 2024

Man-in-the-middle attackers can inject cleartext commands into encrypted SMTP sessions in Postfix, bypassing TLS security protections.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2011-0411?

CVE-2011-0411 is a medium-severity vulnerability in n/a, published on 16 Mar 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-264

Which versions are affected by CVE-2011-0411?

It affects 1 product.

Linux distribution packages (12)

`postfix` Red Hat:enterprise_linux:6::client	All versions	`2:2.6.6-2.1.el6_0`
`postfix-debuginfo` Red Hat:enterprise_linux:6::client	All versions	`2:2.6.6-2.1.el6_0`
`postfix-perl-scripts` Red Hat:enterprise_linux:6::client	All versions	`2:2.6.6-2.1.el6_0`
`postfix` Red Hat:enterprise_linux:6::computenode	All versions	`2:2.6.6-2.1.el6_0`
`postfix-debuginfo` Red Hat:enterprise_linux:6::computenode	All versions	`2:2.6.6-2.1.el6_0`
`postfix-perl-scripts` Red Hat:enterprise_linux:6::computenode	All versions	`2:2.6.6-2.1.el6_0`
`postfix` Red Hat:enterprise_linux:6::server	All versions	`2:2.6.6-2.1.el6_0`
`postfix-debuginfo` Red Hat:enterprise_linux:6::server	All versions	`2:2.6.6-2.1.el6_0`
`postfix-perl-scripts` Red Hat:enterprise_linux:6::server	All versions	`2:2.6.6-2.1.el6_0`
`postfix` Red Hat:enterprise_linux:6::workstation	All versions	`2:2.6.6-2.1.el6_0`
`postfix-debuginfo` Red Hat:enterprise_linux:6::workstation	All versions	`2:2.6.6-2.1.el6_0`
`postfix-perl-scripts` Red Hat:enterprise_linux:6::workstation	All versions	`2:2.6.6-2.1.el6_0`

Products include Postfix Postfix.

How do I fix CVE-2011-0411?

Upgrade to a fixed version.

Is CVE-2011-0411 being exploited?

There is no known exploitation of CVE-2011-0411 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2011-0411, GHSA-2gf2-4wwm-4cm6, RHSA-2011:0423.