Debian Security Advisory
DSA-1852-1 fetchmail -- insufficient input validation
- Date Reported:
- 07 Aug 2009
- Affected Packages:
- fetchmail
- Vulnerable:
- Yes
- Security database references:
- In Mitre's CVE dictionary: CVE-2009-2666.
- More information:
-
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.
- Fixed in:
-
Debian GNU/Linux 4.0 (etch)
- Source:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2.dsc
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6.orig.tar.gz
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2.diff.gz
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6.orig.tar.gz
- Architecture-independent component:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmailconf_6.3.6-1etch2_all.deb
- Alpha:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_alpha.deb
- AMD64:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_amd64.deb
- ARM:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_arm.deb
- HP Precision:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_hppa.deb
- Intel IA-32:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_i386.deb
- Intel IA-64:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_ia64.deb
- PowerPC:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_powerpc.deb
- IBM S/390:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_s390.deb
- Sun Sparc:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.6-1etch2_sparc.deb
Debian GNU/Linux 5.0 (lenny)
- Source:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1.dsc
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1.diff.gz
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2.orig.tar.gz
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1.diff.gz
- Architecture-independent component:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmailconf_6.3.9~rc2-4+lenny1_all.deb
- Alpha:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_alpha.deb
- AMD64:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_amd64.deb
- ARM:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_arm.deb
- ARM EABI:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_armel.deb
- HP Precision:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_hppa.deb
- Intel IA-32:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_i386.deb
- Intel IA-64:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_ia64.deb
- Big-endian MIPS:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_mips.deb
- Little-endian MIPS:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_mipsel.deb
- PowerPC:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_powerpc.deb
- IBM S/390:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_s390.deb
- Sun Sparc:
- http://security.debian.org/pool/updates/main/f/fetchmail/fetchmail_6.3.9~rc2-4+lenny1_sparc.deb
MD5 checksums of the listed files are available in the original advisory.