Lynx CRLF injection could be used to send faked HTTP headers

lynx-crlf-injection (9887) The risk level is classified as MediumMedium Risk


Lynx is a popular text-based Web browser for Unix systems. Lynx fails to remove special character combinations from URL requests. A remote attacker could add CRLF (Carriage Return - Line Feed) combinations to a URL request entered in the Lynx command-line or in the WWW_HOME environment variable to cause faked HTTP headers to be sent. This could result in files that use Lynx for file downloads to be redirected to the wrong Web server.


Bypass Security


Apply the lynx2.8.4rel.1c patch, as listed in VulnWatch Mailing List, Sun Aug 18 2002 - 19:17:04 CDT. See References.

For Caldera OpenLinux 3.1 and 3.1.1 (Workstation and Server):
Upgrade to the latest lynx package (2.8.4-1 or later), as listed in the SCO Security Advisory CSSA-2002-049.0. See References.

For Debian GNU/Linux:
Upgrade to the latest lynx or lynx-ssl package, as listed below. Refer to DSA-210-1 for more information. See References.

Debian GNU/Linux 2.2 (potato): 2.8.3-1.1 or later
Debian GNU/Linux 3.0 (woody): or later

Debian GNU/Linux 2.2 (potato): or later
Debian GNU/Linux 3.0 (woody): or later

For Red Hat Linux:
Upgrade to the latest lynx package, as listed below. Refer to RHSA-2003:029-08 for more information. See References.

Red Hat 6.2: lynx-2.8.3-2.1 or later
Red Hat 7.0 and 7.1 for iSeries and pSeries: lynx-2.8.4-9.1 or later
Red Hat 7.2 and 7.3: lynx-2.8.4-18.1 or laterM
Red Hat 8.0: lynx-2.8.5-7.1 or later

For OpenPKG:
Upgrade to the latest lynx package as listed below. Refer to OpenPKG Security Advisory OpenPKG-SA-2003.011 for more information. See References.

OpenPKG CURRENT: 2.8.4-20021216 or later
OpenPKG 1.2: 2.8.4-1.2.0 or later
OpenPKG 1.1: 2.8.4-1.1.1 or later

For Mandrake Linux 7.2, 8.0, 8.1, 8.2, 9.0, Multi Network Firewall 8.2, and Single Network Firewall 7.2:
Upgrade to the latest lynx package (2.8.5-0.10mdk or later) as listed in MandrakeSoft Security Advisory MDKSA-2003:023:lynx. See References.

For Conectiva Linux:
Upgrade to the latest lynx package, as listed below. Refer to Conectiva Linux Security Announcement CLSA-2003:720 for more information. See References.

Conectiva Linux 7.0: 2.8.4-1U70_1cl or later
Conectiva Linux 8: 2.8.4-4U80_1cl or later

For Sun Linux 5.0:
Apply the appropriate patch for your system. Refer to Sun Alert ID: 55940 for more information. See References.

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


Platforms Affected:

  • Conectiva Linux 7.0
  • Conectiva Linux 8.0
  • Debian Debian Linux 2.2
  • Debian Debian Linux 3.0
  • Lynx Lynx 2.8.2rel.1
  • Lynx Lynx 2.8.3rel.1
  • Lynx Lynx 2.8.4rel.1
  • Lynx Lynx 2.8.5dev.5
  • MandrakeSoft Mandrake Linux 7.2
  • MandrakeSoft Mandrake Linux 8.0 PPC
  • MandrakeSoft Mandrake Linux 8.0
  • 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 Multi Network Firewall 8.2
  • MandrakeSoft Mandrake Single Network Firewall 7.2
  • OpenPKG OpenPKG 1.1
  • OpenPKG OpenPKG 1.2
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Linux 6.2
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.1 for iSeries
  • RedHat Linux 7.1 for pSeries
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • RedHat Linux 8.0
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • SCO Caldera OpenLinux Server 3.1
  • SCO Caldera OpenLinux Server 3.1.1
  • SCO Caldera OpenLinux Workstation 3.1
  • SCO Caldera OpenLinux Workstation 3.1.1
  • Sun Linux 5.0


Aug 18, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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