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Home » Hacking News » DSA 120-1-libapache-mod-ssl, apache-ssl

DSA 120-1-libapache-mod-ssl, apache-ssl

by Nikola Strahija on March 12th, 2002 Ed Moyle recently found a buffer overflow in Apache-SSL and mod_ssl. With session caching enabled, mod_ssl will serialize SSL session variables to store them for later use. These variables were stored in a buffer of a fixed size without proper boundary checks.

To exploit the overflow, the server must be configured to require client
certificates, and an attacker must obtain a carefully crafted client
certificate that has been signed by a Certificate Authority which is
trusted by the server. If these conditions are met, it would be possible
for an attacker to execute arbitrary code on the server.

This problem has been fixed in version of Apache-SSL and
version 2.4.10-1.3.9-1potato1 of libapache-mod-ssl for the stable
Debian distribution as well as in version of
Apache-SSL and version 2.8.7-1 of libapache-mod-ssl for the testing
and unstable distribution of Debian.

We recommend that you upgrade your Apache-SSL and mod_ssl packages.

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 2.2 alias potato
- ------------------------------------

Source archives:
MD5 checksum: 3da52b3f9126fe25005b5aca78842412
MD5 checksum: 5486c0c68cabd056c64ad13193606e6c
MD5 checksum: e28b3b656449a5a2f9080286ae3d743e
MD5 checksum: 33535057f5f2f84005206c2917b8330e
MD5 checksum: 3a94a4a714cbb70e5aa270654f42be40
MD5 checksum: cb0f2e07065438396f0d5df403dd2c16

Architecture independent components:
MD5 checksum: 504b8cad4b600ff0e0293998e62c0e00

Alpha architecture:
MD5 checksum: 0c71a5c18bd0fff6f6c981ba50a9c7aa
MD5 checksum: 785dca8af6fbf7c26f91c50ccb013dff

ARM architecture:
MD5 checksum: a198919424658154ba70ca825ea1033f
MD5 checksum: 31d195deef66b4e655a366ac677c81ec

Intel ia32 architecture:
MD5 checksum: 5085998b8751242a7e9c59b4806a7b24
MD5 checksum: e9a64fab4b7891f00b7e66f524ec0ec9

Motorola 680x0 architecture:
MD5 checksum: 55e91cb1aa3ff88c7c68440c8b1e4854
MD5 checksum: 27ba5cc1188b0eef0dc6a9f1d790c08a

PowerPC architecture:
MD5 checksum: 7832352ee0b9254d4ed2cf54ac5486fa
MD5 checksum: ba638df06f1f0d671e4cb0b02bc2f53c

Sun Sparc architecture:
MD5 checksum: 50277f2251d1c0df8dc610f30cc866fc
MD5 checksum: 77c1a0034ba5b95f042dbe51a609d191

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

For apt-get: deb stable/updates main
For dpkg-ftp:
Mailing list: [email protected]
Package info: `apt-cache show ' and

Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see


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