Title: Apache mod_usertrack Predictable ID Generation Vulnerability
Severity: MODERATE
Description:
Apache is a popular open-source HTTP server in wide use across the Internet. Apache ships with a module called 'mod_usertrack'. This module contains code to generate unique identifiers for individual web sessions and requests.
The IDs that are generated are not not random. They are generated using the IP address of the client, the system time and the server process ID. As they are non-random, these IDs are not meant to be used for authentication purposes. Any applications that rely on these IDs for tracking authenticated sessions may be vulnerable to ID prediction attacks.
Depending on the application, an attacker who can predict an ID can possibly hijack user sessions and accounts.
If an attacker has local access to the machine, information like system time and server process IDs can be obtained without guessing.
It should be noted that this is not a vulnerability in Apache. This is only a vulnerability when an application uses these IDs to track authenticated users.
Affected Products:
- Apache Software Foundation Apache 1.3.11
- Apache Software Foundation Apache 1.3.12
- Apache Software Foundation Apache 1.3.14
- Apache Software Foundation Apache 1.3.17
- Apache Software Foundation Apache 1.3.18
- Apache Software Foundation Apache 1.3.19
- Apache Software Foundation Apache 1.3.20
- Debian Linux 2.3.0
- EnGarde Secure Linux 1.0.1
- HP Secure OS software for Linux 1.0.0
- IBM HTTP Server 1.3.19
- MandrakeSoft Corporate Server 1.0.1
- MandrakeSoft Linux Mandrake 7.1.0
- MandrakeSoft Linux Mandrake 7.2.0
- MandrakeSoft Linux Mandrake 8.0.0
- MandrakeSoft Linux Mandrake 8.0.0 ppc
- MandrakeSoft Linux Mandrake 8.1.0
- MandrakeSoft Single Network Firewall 7.2.0
- Netscreen NetScreen-Global PRO Express Policy Manager Server
- Netscreen NetScreen-Global PRO Policy Manager Server
- OpenBSD OpenBSD 2.8.0
- OpenBSD OpenBSD 2.9.0
- OpenBSD OpenBSD 3.0
- RedHat Linux 6.2.0 alpha
- RedHat Linux 6.2.0 i386
- RedHat Linux 6.2.0 sparc
- RedHat Linux 7.0.0 alpha
- RedHat Linux 7.0.0 i386
- S.u.S.E. Linux 6.4.0
- S.u.S.E. Linux 6.4.0 alpha
- S.u.S.E. Linux 6.4.0 i386
- S.u.S.E. Linux 6.4.0 ppc
- S.u.S.E. Linux 7.0.0
- S.u.S.E. Linux 7.0.0 alpha
- S.u.S.E. Linux 7.0.0 i386
- S.u.S.E. Linux 7.0.0 ppc
- S.u.S.E. Linux 7.0.0 sparc
- S.u.S.E. Linux 7.1.0
- S.u.S.E. Linux 7.1.0 alpha
- S.u.S.E. Linux 7.1.0 ppc
- S.u.S.E. Linux 7.1.0 sparc
- S.u.S.E. Linux 7.1.0 x86
- S.u.S.E. Linux 7.2.0
- S.u.S.E. Linux 7.2.0 i386
- S.u.S.E. Linux 7.3.0
- S.u.S.E. Linux 7.3.0 i386
- S.u.S.E. Linux 7.3.0 ppc
- S.u.S.E. Linux 7.3.0 sparc
- SGI IRIX 6.5.0
- SGI IRIX 6.5.1
- SGI IRIX 6.5.10
- SGI IRIX 6.5.11
- SGI IRIX 6.5.12
- SGI IRIX 6.5.12 f
- SGI IRIX 6.5.12 m
- SGI IRIX 6.5.13
- SGI IRIX 6.5.13 f
- SGI IRIX 6.5.13 m
- SGI IRIX 6.5.14
- SGI IRIX 6.5.14 f
- SGI IRIX 6.5.14 m
- SGI IRIX 6.5.15
- SGI IRIX 6.5.16
- SGI IRIX 6.5.17
- SGI IRIX 6.5.18
- SGI IRIX 6.5.2
- SGI IRIX 6.5.3
- SGI IRIX 6.5.4
- SGI IRIX 6.5.5
- SGI IRIX 6.5.6
- SGI IRIX 6.5.7
- SGI IRIX 6.5.8
- SGI IRIX 6.5.9
- Slackware Linux 8.0.0
- Sun Cobalt Control Station 4100CS
- Sun Cobalt ManageRaQ v2 3599BD
- Sun Cobalt Qube3 4000WG
- Sun Cobalt RaQ 550
- Sun Cobalt RaQ XTR 3500R
- Sun Cobalt RaQ4 3001R
- Sun Solaris 9
- Sun Solaris 9_x86
- Sun Solaris 9_x86 Update 2
- Sun SunOS 5.9.0
- Sun SunOS 5.9.0 _x86
References:
- Apache Software Foundation: Apache Software Foundation Homepage
- David Endler: Brute-Forcing Web Session IDs
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