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TITLE:
Linksys WAG54GS Cross-Site Scripting and Cross-Site Request Forgery
Vulnerabilities

SECUNIA ADVISORY ID:
SA27738

VERIFY ADVISORY:
http://secunia.com/advisories/27738/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

OPERATING SYSTEM:
Linksys WAG54GS Wireless-G ADSL Gateway with SpeedBooster 1.x
http://secunia.com/product/16625/

DESCRIPTION:
Adrian Pastor has reported some vulnerabilities in Linksys WAG54GS,
which can be exploited by malicious people to conduct cross-site
scripting and cross-site request forgery attacks.

1) Input passed to the "devname", "snmp_getcomm", "snmp_setcomm", and
"c4_trap_ip_" parameters in setup.cgi is not properly sanitised before
being returned to the user. This can be exploited to execute arbitrary
HTML and script code in a user's browser session in context of an
affected site.

2) The application allows users to perform certain actions via HTTP
requests without performing any validity checks to verify the
request. This can be exploited to e.g. perform certain administrative
actions by enticing a logged-in administrator to visit a malicious
site.

The vulnerabilities are reported in firmware version 1.00.06. Other
versions may also be affected.

SOLUTION:
Vulnerability #1 has reportedly been fixed in firmware version
1.01.03.

Do not browse untrusted websites or follow untrusted links while
logged on to the device.

PROVIDED AND/OR DISCOVERED BY:
Adrian Pastor

ORIGINAL ADVISORY:
http://www.gnucitizen.org/blog/persistent-xss-and-csrf-on-wireless-g-adsl-gateway-with-speedbooster-wag54gs

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