Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| CHORNY | Apache::Session::Generate::MD5 | ≤ 1.94 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache-session-perl | No fix yet | — |
| Debian 13 | libapache-session-perl | No fix yet | — |
| Debian 12 | libapache-session-perl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libapache-session-perl | No fix yet | — |
| Ubuntu 26.04 LTS | libapache-session-perl | No fix yet | — |
| Ubuntu 25.10 | libapache-session-perl | No fix yet | — |
| Ubuntu 24.04 LTS | libapache-session-perl | No fix yet | — |
| Ubuntu 22.04 LTS | libapache-session-perl | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libapache-session-perl | No fix yet | — |
| Ubuntu 18.04 LTS | libapache-session-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libapache-session-perl | No fix yet | — |
References
- https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27
- https://security.metacpan.org/docs/guides/random-data-for-security.html technical-description
- https://github.com/chorny/Apache-Session/issues/4 issue-tracking
- https://rt.cpan.org/Ticket/Display.html?id=173631 issue-tracking
- https://www.openwall.com/lists/oss-security/2019/06/15/1 mailing-list
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659 issue-tracking
- https://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bdabd71c2f91b18526e31a9dc52b4c17b3d246b7#898a4b8b00022df1b8689910b67707f3e738d180 patch
- https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633 issue-tracking
- https://metacpan.org/pod/Apache::Session::Generate::Random