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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Chorny Apache\
cpe:2.3:a:chorny:apache\:\:session\:\:generate\:\:md5:*:*:*:*:*:perl:*:*
|
— |
<= 1.94
|
References 10
https://github.com/chorny/Apache-Session/issues/4
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https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5…
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https://rt.cpan.org/Ticket/Display.html?id=173631
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https://security.metacpan.org/docs/guides/random-data-for-security.html
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http://www.openwall.com/lists/oss-security/2026/03/05/3
af854a3a-2127-422b-91ae-364da2661108
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659
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https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633
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https://metacpan.org/pod/Apache::Session::Generate::Random
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https://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/co…
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https://www.openwall.com/lists/oss-security/2019/06/15/1
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