Description
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely. PAGI::Middleware::Session::Store::Cookie attempts to read bytes from the /dev/urandom device directly. If that fails (for example, on systems without the device, such as Windows), then it will emit a warning that recommends the user install Crypt::URandom, and then return a string of random bytes generated by the built-in rand function, which is unsuitable for cryptographic applications. This modules does not use the Crypt::URandom module, and installing it will not fix the problem. The random bytes are used for generating an initialisation vector (IV) to encrypt the cookie. A predictable IV may make it easier for malicious users to decrypt and tamper with the session data that is stored in the cookie.
Problem types
CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator
CWE-1204 Generation of Weak Initialization Vector (IV)
Product status
Any version
References
www.openwall.com/lists/oss-security/2026/03/31/10
metacpan.org/.../lib/PAGI/Middleware/Session/Store/Cookie.pm
metacpan.org/...leware-Session-Store-Cookie-0.001004/changes