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Debian: Security update for Postfix

Several vulnerabilities were discovered in Postfix, a mail transfer agent. The postinst script grants the postfix user write access to /var/spool/postfix/pid, which might allow local users to conduct symlink attacks that overwrite arbitrary files. The STARTTLS implementation 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. A heap-based read-only buffer overflow allows malicious clients to crash the smtpd server process using a crafted SASL authentication request. Updated packages are available from security.debian.org.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- -------------------------------------------------------------------------
Debian Security Advisory DSA-2233-1                   security@debian.org
http://www.debian.org/security/                            Florian Weimer
May 10, 2011                           http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package        : postfix
Vulnerability  : several
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2009-2939 CVE-2011-0411 CVE-2011-1720

Several vulnerabilities were discovered in Postfix, a mail transfer
agent.  The Common Vulnerabilities and Exposures project identifies
the following problems:

CVE-2009-2939
       The postinst script grants the postfix user write access to
       /var/spool/postfix/pid, which might allow local users to
       conduct symlink attacks that overwrite arbitrary files.

CVE-2011-0411
       The STARTTLS implementation 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.

CVE-2011-1720
       A heap-based read-only buffer overflow allows malicious
       clients to crash the smtpd server process using a crafted SASL
       authentication request.

For the oldstable distribution (lenny), this problem has been fixed in
version 2.5.5-1.1+lenny1.

For the stable distribution (squeeze), this problem has been fixed in
version 2.7.1-1+squeeze1.

For the unstable distribution (sid), this problem has been fixed in
version 2.8.0-1.

We recommend that you upgrade your postfix packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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