Webmin and Usermin session ID spoofing root access

webmin-usermin-root-access (11390) The risk level is classified as HighHigh Risk


Webmin could allow a remote attacker to spoof a session ID (SID) and inject the SID into a Access Control List (ACL) to gain root access to the system, caused by improper filtering of user-supplied input by the miniserv.pl script. If the "password timeouts" option is enabled and a valid username is known, a remote attacker could spoof a session ID by supplying a BASE64 encoded authentication string containing CRLF (Carriage Return - Line Feed) sequences to bypass authentication and execute arbitrary commands on the system with root privileges.


Gain Access


Upgrade to the latest version of Webmin (1.070 or later), available from the Webmin Web page. See References.

For Gentoo Linux:
Upgrade to the latest version of Webmin (1.070 or later) or Usermin (1.000 or later), as listed in Gentoo Linux Security Announcement 200302-14. See References.

For Mandrake Linux:
Upgrade to the latest webmin package, as listed below. Refer to MandrakeSoft Security Advisory MDKSA-2003:025:webmin for more information. See References.

Mandrake Linux 7.2 and Single Network Firewall 7.2: 0.970-2.1mdk or later
Mandrake Linux 8.0: 0.970-2.2mdk or later
Mandrake Linux 8.1 and 8.2: 0.970-2.3mdk or later
Mandrake Linux 9.0: 0.990-6.1mdk or later

For EnGarde Secure Linux Community Edition:
Upgrade to the latest WebTool package (1.2-1.0.74 or later), as listed in EnGarde Secure Linux Security Advisory ESA-20030225-0. See References.

Upgrade to the latest version of IRIX (6.5.20 or later), when it becomes available, as listed in SGI Security Advisory 20030602-01-I. See References.

— OR —

Install the upgraded websetup package for your system, as listed in SGI Security Advisory 20030602-01-I. See References.

For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest webmin package (0.94-7woody1 or later), as listed in DSA-319-1. See References.

For Caldera OpenLinux Server and Workstation 3.1.1:
Upgrade to the latest version of webmin (0.89-12 or later), as listed in SCO Security Advisory CSSA-2003-035.0. See References.

For HP-UX 11.00, 11.11, 11.20, and 11.22 :
Upgrade to the version of webmin with the security fix, as listed in Hewlett-Packard Company Security Bulletin HPSBUX0303-250. See References.

For other distributions:
Contact your vendor for upgrade or patch information.


Platforms Affected:

  • Debian Debian Linux 3.0
  • EngardeLinux Secure Linux
  • Gentoo Linux
  • Gentoo Webmin prior to 1.070
  • HP HP-UX 11.00
  • HP HP-UX 11.11
  • HP HP-UX 11.20
  • HP HP-UX 11.22
  • MandrakeSoft Mandrake Linux 7.2
  • MandrakeSoft Mandrake Linux 8.0
  • MandrakeSoft Mandrake Linux 8.0 PPC
  • MandrakeSoft Mandrake Linux 8.1
  • MandrakeSoft Mandrake Linux 8.1 IA64
  • MandrakeSoft Mandrake Linux 8.2 PPC
  • MandrakeSoft Mandrake Linux 8.2
  • MandrakeSoft Mandrake Linux 9.0
  • MandrakeSoft Mandrake Single Network Firewall 7.2
  • SCO Caldera OpenLinux Server 3.1.1
  • SCO Caldera OpenLinux Workstation 3.1.1
  • SGI IRIX 6.5
  • SGI IRIX 6.5 20
  • SGI IRIX 6.5.1
  • SGI IRIX 6.5.10
  • SGI IRIX 6.5.10f
  • SGI IRIX 6.5.10m
  • SGI IRIX 6.5.11
  • SGI IRIX 6.5.11f
  • SGI IRIX 6.5.11m
  • SGI IRIX 6.5.12
  • SGI IRIX 6.5.12f
  • SGI IRIX 6.5.12m
  • SGI IRIX 6.5.13
  • SGI IRIX 6.5.13f
  • SGI IRIX 6.5.13m
  • SGI IRIX 6.5.14
  • SGI IRIX 6.5.14f
  • SGI IRIX 6.5.14m
  • SGI IRIX 6.5.15
  • SGI IRIX 6.5.15f
  • SGI IRIX 6.5.15m
  • SGI IRIX 6.5.16
  • SGI IRIX 6.5.16f
  • SGI IRIX 6.5.16m
  • SGI IRIX 6.5.17
  • SGI IRIX 6.5.17f
  • SGI IRIX 6.5.17m
  • SGI IRIX 6.5.18
  • SGI IRIX 6.5.18f
  • SGI IRIX 6.5.18m
  • SGI IRIX 6.5.19
  • SGI IRIX 6.5.2f
  • SGI IRIX 6.5.2m
  • SGI IRIX 6.5.3
  • SGI IRIX 6.5.3f
  • SGI IRIX 6.5.3m
  • SGI IRIX 6.5.4
  • SGI IRIX 6.5.4f
  • SGI IRIX 6.5.4m
  • SGI IRIX 6.5.5
  • SGI IRIX 6.5.5f
  • SGI IRIX 6.5.5m
  • SGI IRIX 6.5.6
  • SGI IRIX 6.5.6f
  • SGI IRIX 6.5.6m
  • SGI IRIX 6.5.7
  • SGI IRIX 6.5.7f
  • SGI IRIX 6.5.7m
  • SGI IRIX 6.5.8
  • SGI IRIX 6.5.8f
  • SGI IRIX 6.5.8m
  • SGI IRIX 6.5.9
  • SGI IRIX 6.5.9f
  • SGI IRIX 6.5.9m
  • Usermin Project Usermin prior to 1.000


Feb 22, 2003

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