/ 
Apache-Session-1.94
/ Apache::Session::Generate::ModUsertrack
Security Advisories (3)
CVE-2013-10075 (2026-05-08)

Apache::Session versions through 1.94 for Perl re-creates deleted sessions. The session stores Apache::Session::Store::File and Apache::Session::Store::DB_File will create a session that does not exist. This can lead to sessions being revived, potentially with data that was to be deleted.

CVE-2025-40931 (2026-03-05)

Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id. Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems. Note that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom.

CVE-2026-5081 (2026-05-06)

Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation. The server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header). The purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes.

NAME

Apache::Session::Generate::ModUsertrack - mod_usertrack for session ID generation

SYNOPSIS

use Apache::Session::Flex;

tie %session, 'Apache::Session::Flex', $id, {
    Store     => 'MySQL',
    Lock      => 'Null',
    Generate  => 'ModUsertrack',
    Serialize => 'Storable',
    ModUsertrackCookieName => 'usertrack', # optional
};

DESCRIPTION

Apache::Session::Generate::ModUsertrack enables you to use cookie tracked by mod_usertrack as session id for Apache::Session framework. This module fits well with long-term sessions, so better using RDBMS like MySQL for its storage.

CONFIGURATION

This module accepts one extra configuration option.

ModUsertrackCookieName

Specifies cookie name used in mod_usertrack. Apache for default, so change this if you change it via CookieName directive in mod_usertrack.

LIMITATION WITHOUT MOD_PERL

This module first tries to fetch named cookie, but will in vain ONLY WHEN the HTTP request is the first one from specific client to the mod_usertrack enabled Apache web server. It is because if the request is for the first time, cookies are not yet baked on clients.

If you run scripts under mod_perl, this module tries to steal (not yet baked) cookie from Apache request notes.

See Apache for details.

AUTHOR

Tatsuhiko Miyagawa <miyagawa@bulknews.net>

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

Apache::Session, Apache::Session::Flex, mod_usertrack