Articles / Debian: New fetchmail packa…

Debian: New fetchmail packages fix SSL certificate verification weakness

It was discovered that fetchmail, a full-featured remote mail retrieval and forwarding utility, is vulnerable to the “Null Prefix Attacks Against SSL/TLS Certificates” recently published at the Blackhat conference. This allows an attacker to perform undetected man-in-the-middle attacks via a crafted ITU-T X.509 certificate with an injected null byte in the subjectAltName or Common Name fields. Updated packages are available from security.debian.org.

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

- --------------------------------------------------------------------------
Debian Security Advisory DSA-1852-1                    security@debian.org
http://www.debian.org/security/                                 Nico Golde
August 7th, 2009                        http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : fetchmail
Vulnerability  : insufficient input validation
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2009-2666

It was discovered that fetchmail, a full-featured remote mail retrieval
and forwarding utility, is vulnerable to the "Null Prefix Attacks Against
SSL/TLS Certificates" recently published at the Blackhat conference.
This allows an attacker to perform undetected man-in-the-middle attacks
via a crafted ITU-T X.509 certificate with an injected null byte in the
subjectAltName or Common Name fields.

Note, as a fetchmail user you should always use strict certificate
validation through either these option combinations:
   sslcertck ssl sslproto ssl3    (for service on SSL-wrapped ports)
or
   sslcertck sslproto tls1        (for STARTTLS-based services)


For the oldstable distribution (etch), this problem has been fixed in
version 6.3.6-1etch2.

For the stable distribution (lenny), this problem has been fixed in
version 6.3.9~rc2-4+lenny1.

For the testing distribution (squeeze), this problem will be fixed soon.

For the unstable distribution (sid), this problem has been fixed in
version 6.3.9~rc2-6.


We recommend that you upgrade your fetchmail packages.

Upgrade instructions
- --------------------

wget url
       will fetch the file for you
dpkg -i file.deb
       will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
       will update the internal database
apt-get upgrade
       will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 4.0 alias etch
- -------------------------------

Debian (oldstable)
- ------------------

Oldstable updates are available for alpha, amd64, arm, hppa, i386, ia64, mips, mipsel, powerpc, s390 and sparc.

Source archives:

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2.dsc
   Size/MD5 checksum:      882 5d96480a102ad30f66dbac6bcbae1037
 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6.orig.tar.gz
   Size/MD5 checksum:  1680200 04175459cdf32fdb10d9e8fc46b633c3
 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2.diff.gz
   Size/MD5 checksum:    45665 a51b0544434e51577863032336812bd6

Architecture independent packages:

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmailconf_6.3.6-1etch2_all.deb
   Size/MD5 checksum:    61444 f65648771182f763268cbc7fd643da8b

alpha architecture (DEC Alpha)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_alpha.deb
   Size/MD5 checksum:   666592 289c6c238d70e71771d5c0c87b764a87

amd64 architecture (AMD x86_64 (AMD64))

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_amd64.deb
   Size/MD5 checksum:   649604 8d2e4ff30c29e9e67831ec9aab5a567e

arm architecture (ARM)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_arm.deb
   Size/MD5 checksum:   645170 928f041ad7b0311ac0188e4e6ca6256f

hppa architecture (HP PA RISC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_hppa.deb
   Size/MD5 checksum:   658340 511591dee94637fe440c6a737a3fd880

i386 architecture (Intel ia32)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_i386.deb
   Size/MD5 checksum:   642772 5ddc7364f8f34b1b12d1e5b17ff9ac6d

ia64 architecture (Intel ia64)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_ia64.deb
   Size/MD5 checksum:   700924 6d7f77eca56a191e0fab3bdf8fa98c37

powerpc architecture (PowerPC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_powerpc.deb
   Size/MD5 checksum:   647274 771f97aa2d2029135185afcbf05b605c

s390 architecture (IBM S/390)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_s390.deb
   Size/MD5 checksum:   647026 f2ac2a5ce6f648b7d88948530456d02d

sparc architecture (Sun SPARC/UltraSPARC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_sparc.deb
   Size/MD5 checksum:   640688 974ffde76095f1fa184cf1eced7b7dae


Debian GNU/Linux 5.0 alias lenny
- --------------------------------

Debian (stable)
- ---------------

Stable updates are available for alpha, amd64, arm, armel, hppa, i386, ia64, mips, mipsel, powerpc, s390 and sparc.

Source archives:

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1.dsc
   Size/MD5 checksum:     1375 39a3debdf4c4cf3e313c75e5688209ca
 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1.diff.gz
   Size/MD5 checksum:    46891 a2715b1768546ea2d7a3c8a518aa8188
 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2.orig.tar.gz
   Size/MD5 checksum:  1711087 200ece6f73ac28ccda7aea42ea4e492d

Architecture independent packages:

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmailconf_6.3.9~rc2-4+lenny1_all.deb
   Size/MD5 checksum:    63124 1cd8fa8a8367a1bc8f1d30ff2d8ff3ee

alpha architecture (DEC Alpha)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_alpha.deb
   Size/MD5 checksum:   680224 1a2ddefc8a90da5e2d31291f1101442c

amd64 architecture (AMD x86_64 (AMD64))

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_amd64.deb
   Size/MD5 checksum:   668616 65015cc17b556da2e44ef1496171e9fd

arm architecture (ARM)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_arm.deb
   Size/MD5 checksum:   663090 4b4fccf839ee8b6f1f94a997ac911179

armel architecture (ARM EABI)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_armel.deb
   Size/MD5 checksum:   662018 837c3029b01e180f2447ff0f19555dc5

hppa architecture (HP PA RISC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_hppa.deb
   Size/MD5 checksum:   673570 7dbce7d81c38e4fa9562626610b09f65

i386 architecture (Intel ia32)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_i386.deb
   Size/MD5 checksum:   657844 a9e357f91278e9108018725c96eeb8ae

ia64 architecture (Intel ia64)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_ia64.deb
   Size/MD5 checksum:   719116 4b2f362a01870c0770f010bcc5012aad

mips architecture (MIPS (Big Endian))

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_mips.deb
   Size/MD5 checksum:   664870 2abf34330924241ce890b703709c5895

mipsel architecture (MIPS (Little Endian))

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_mipsel.deb
   Size/MD5 checksum:   663906 88af289787ec5fd46c83f28a0de65849

powerpc architecture (PowerPC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_powerpc.deb
   Size/MD5 checksum:   669542 7c9a426df9ef71c0420ccb030e5d422b

s390 architecture (IBM S/390)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_s390.deb
   Size/MD5 checksum:   666976 6aa0fd370bd06f3c39d9230c82cde208

sparc architecture (Sun SPARC/UltraSPARC)

 http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_sparc.deb
   Size/MD5 checksum:   658912 699f23466f0003f7f38f02111d5a3363


 These files will probably be moved into the stable distribution on
 its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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