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[ GLSA 200511-09 ] Lynx: Arbitrary command execution
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GLSA
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Joined: 12 May 2004
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PostPosted: Sun Nov 13, 2005 5:27 pm    Post subject: [ GLSA 200511-09 ] Lynx: Arbitrary command execution Reply with quote

Gentoo Linux Security Advisory

Title: Lynx: Arbitrary command execution (GLSA 200511-09)
Severity: normal
Exploitable: remote
Date: November 13, 2005
Bug(s): #112213
ID: 200511-09

Synopsis


Lynx is vulnerable to an issue which allows the remote execution of
arbitrary commands.


Background


Lynx is a fully-featured WWW client for users running
cursor-addressable, character-cell display devices such as vt100
terminals and terminal emulators.


Affected Packages

Package: www-client/lynx
Vulnerable: < 2.8.5-r2
Unaffected: >= 2.8.5-r2
Architectures: All supported architectures


Description


iDefense labs discovered a problem within the feature to execute
local cgi-bin programs via the "lynxcgi:" URI handler. Due to a
configuration error, the default settings allow websites to specify
commands to run as the user running Lynx.


Impact


A remote attacker can entice a user to access a malicious HTTP
server, causing Lynx to execute arbitrary commands.


Workaround


Disable "lynxcgi" links by specifying the following directive in
lynx.cfg:
Code:

    TRUSTED_LYNXCGI:none


Resolution


All Lynx users should upgrade to the latest version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=www-client/lynx-2.8.5-r2"


References

CVE-2005-2929
iDefense Security Advisory 11.11.05


Last edited by GLSA on Sun Mar 27, 2011 4:20 am; edited 5 times in total
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