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Debian GNU/Linux Advisory: openssl095

Oct 13, 2003, 01:39 (0 Talkback[s])

Debian Security Advisory DSA 394-1 security@debian.org
http://www.debian.org/security/ Martin Schulze
October 11th, 2003 http://www.debian.org/security/faq

Package : openssl095
Vulnerability : ASN.1 parsing vulnerability
Problem-Type : remote
Debian-specific : no
CVE references : CAN-2003-0543 CAN-2003-0544 CAN-2003-0545

Steve Henson of the OpenSSL core team identified and prepared fixes for a number of vulnerabilities in the OpenSSL ASN1 code that were discovered after running a test suite by British National Infrastructure Security Coordination Centre (NISCC).

A bug in OpenSSLs SSL/TLS protocol was also identified which causes OpenSSL to parse a client certificate from an SSL/TLS client when it should reject it as a protocol error.

The Common Vulnerabilities and Exposures project identifies the following problems:


Integer overflow in OpenSSL that allows remote attackers to cause a denial of service (crash) via an SSL client certificate with certain ASN.1 tag values.


OpenSSL does not properly track the number of characters in certain ASN.1 inputs, which allows remote attackers to cause a denial of service (crash) via an SSL client certificate that causes OpenSSL to read past the end of a buffer when the long form is used.


Double-free vulnerability allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an SSL client certificate with a certain invalid ASN.1 encoding. This bug was only present in OpenSSL 0.9.7 and is listed here only for reference.

For the stable distribution (woody) this problem has been fixed in openssl095 version 0.9.5a-6.woody.3.

This package is not present in the unstable (sid) or testing (sarge) distribution.

We recommend that you upgrade your libssl095a packages and restart services using this library. Debian doesn't ship any packages that are linked against this library.

The following commandline (courtesy of Ray Dassen) produces a list of names of running processes that have libssl095 mapped into their memory space:

find /proc -name maps -exec egrep -l 'libssl095' {} /dev/null ; | sed -e 's/[^0-9]//g' | xargs --no-run-if-empty ps --no-headers -p | sed -e 's/^+//' -e 's/ +/ /g' | cut -d ' ' -f 5 | sort | uniq

You should restart the associated services.

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 3.0 alias woody

Source archives:

Size/MD5 checksum: 631 ba6e597ab2db2984aef6c2a765ac29c0
Size/MD5 checksum: 38851 6b197111a7068a7ea29ef55176771d89
Size/MD5 checksum: 1892089 99d22f1d4d23ff8b927f94a9df3997b4

Alpha architecture:

Size/MD5 checksum: 497152 fe3d6854382f8dbe2d10f3f5700dd8f6

ARM architecture:

Size/MD5 checksum: 402498 551b79fbb80903f174d6edeffd9869df

Intel IA-32 architecture:

Size/MD5 checksum: 399752 2a856ac6b45d41beb0bf78880b236966

Motorola 680x0 architecture:

Size/MD5 checksum: 376738 980e428e9b913672d939ebe77c18cd6d

Big endian MIPS architecture:

Size/MD5 checksum: 412624 b8c7cc0b4dcbf1cf03480b93c78cd610

Little endian MIPS architecture:

Size/MD5 checksum: 407388 de02385580cf33c344c1ffadcf8aed88

PowerPC architecture:

Size/MD5 checksum: 425452 c3d04af89c64e6e9f0175e6cd4997058

Sun Sparc architecture:

Size/MD5 checksum: 412196 ae1181c2873a304c583800459da53e5a

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

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>