HTTP::Session versions through 0.53 for Perl defaults to using insecurely generated session ids.
HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution 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.
The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.
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
High
Complete denial of service
CVSS Vector v3.1
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Ktat Http\
cpe:2.3:a:ktat:http\:\:session:*:*:*:*:*:perl:*:*
|
— |
<= 0.53
|
References 4
https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://security.metacpan.org/docs/guides/random-data-for-security.html
9b29abf9-4ab0-4765-b253-1875cd9b441e
http://www.openwall.com/lists/oss-security/2026/03/28/5
af854a3a-2127-422b-91ae-364da2661108