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[TWiki-Announce] TWiki Security Alert CVE-2014-9367: XSS Vulnerability with Scope and Other URL Parameters of WebSearch
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From: TWiki a. - r. s. a. n. \(l. volume\) <twi...@li...> - 2014-12-16 19:07:40
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Dear TWiki Administrators:
This advisory alerts you of a potential security issue with your TWiki installation: A specially crafted URL parameter to the WebSearch topic may expose a cross-site scripting vulnerability.
NOTE: This is a silent alert to [twiki-announce]. Please DO NOT redistribute this e-mail unless it is to a safe party. A public advisory will follow in two days.
* Vulnerable Software Version
* Attack Vectors
* Impact
* Severity Level
* MITRE Name for this Vulnerability
* Details
* Countermeasures
* Hotfix for TWiki Production Release
* Verify Hotfix
* Authors and Credits
* Action Plan with Timeline
* External Links
* Comments
---++ Vulnerable Software Version
* TWiki-6.0.0 and TWiki-6.0.1 [2]
---++ Attack Vectors
Attack can be done by viewing wiki pages or by logging in by issuing HTTP GET requests towards the TWiki server (usually port 80/TCP).
---++ Impact
Specially crafted parameters open up XSS (Cross-Site Scripting) attacks.
---++ Severity Level
The TWiki SecurityTeam triaged this issue as documented in TWikiSecurityAlertProcess [1] and assigned the following severity level:
* Severity 3 issue: TWiki content or browser is compromised.
---++ MITRE Name for this Vulnerability
The Common Vulnerabilities and Exposures project has assigned the name CVE-2014-9367 [7] to this vulnerability.
---++ Details
A malicious person can use specially crafted URL parameters to TWiki's WebSearch topic that execute arbitrary JavaScript code in the browser. Examples:
Specially crafted parameter to the view script of TWiki's WebSearch topic:
GET /do/view/TWiki/WebSearch?search=Search&scope='"--></style></script><script>alert('CVE-2014-9367 vulnarable!')</script>
TWiki decodes the URL parameters and pops up a !JavaScript alert box showing "CVE-2014-9367 vulnarable!"
---++ Countermeasures
* Apply hotfix (see patch below).
* Use the web server software to restrict access to the web pages served by TWiki.
---++ Hotfix for TWiki Production Release
No TWiki patch release will be done to address this issue. Instead, apply the patches below.
---+++ Patch lib/TWiki.pm
Affected file: =twiki/lib/TWiki.pm=
The patch removes the single quote (') from the regular expression set in sub urlEncode of TWiki.pm:
=======( 8>< CUT )===============================================
--- lib/TWiki.pm (revision 28490)
+++ lib/TWiki.pm (working copy)
@@ -3178,7 +3178,7 @@
sub urlEncode {
my $text = shift;
- $text =~ s/([^0-9a-zA-Z-_.:~!*'\/])/'%'.sprintf('%02x',ord($1))/ge;
+ $text =~ s/([^0-9a-zA-Z-_.:~!*\/])/'%'.sprintf('%02x',ord($1))/ge;
return $text;
}
=======( 8>< CUT )===============================================
The patch might be managed in the e-mail. Get this patch from http://develop.twiki.org/~twiki4/cgi-bin/view/Bugs/Item7596 [8]
---+++ Patch TWiki system topics
Affected topics:
* TWiki.SearchResultsPagination - source:
http://develop.twiki.org/~twiki4/cgi-bin/view/TWiki/SearchResultsPagination?raw=on
* TWiki.WebSearch - source:
http://develop.twiki.org/~twiki4/cgi-bin/view/TWiki/WebSearch?raw=on
* TWiki.WebSearchAdvanced - source:
http://develop.twiki.org/~twiki4/cgi-bin/view/TWiki/WebSearchAdvanced?raw=on
To patch, copy the source of these topics, and do a "Raw Edit" on your topics to replace their content.
__Notes:__
* Learn how to apply patches: http://twiki.org/cgi-bin/view/Codev/HowToApplyPatch
* This issue is tracked at: http://develop.twiki.org/~twiki4/cgi-bin/view/Bugs/Item7596
---++ Verify Hotfix
To verify the patch add the following parameter to TWiki's WebSearch topic:
http://twiki.example.com/do/view/TWiki/WebSearch?search=Search&scope='"--></style></script><script>alert('CVE-2014-9367 vulnarable!')
The site is vulnerable if consecutive dialog boxes are shown with text "CVE-2014-9367 vulnerable!"
---++ Authors and Credits
* Credit to Robert Abela ( robert[at]netsparker.com) and Onur Yilmaz (onur[at]netsparker.com) for disclosing the issue to the twi...@li... mailing list.
* Peter Thoeny for verifying the issue, creating a fix, and creating the patch and advisory.
---++ Action Plan with Timeline
* 2014-12-09 - Robert Abela of Netsparker (https://www.netsparker.com/) discloses issue to TWikiSecurityMailingList
* 2014-12-09 - developer verifies issue - Peter Thoeny
* 2014-12-09 - developer fixes code - Peter Thoeny
* 2014-12-15 - security team creates advisory with hotfix - Peter Thoeny
* 2014-12-16 - send alert to TWikiAnnounceMailingList [5] and TWikiDevMailingList [6] - Peter Thoeny
* 2014-12-18 - publish advisory in Codev web and update all related topics - Peter Thoeny
* 2014-12-18 - issue a public security advisory to fulldisclosure[at]seclists.org, cert[at]cert.org, vuln[at]secunia.com, bugs[at]securitytracker.com, submissions[at]packetstormsecurity.org - Peter Thoeny
---++ External Links
[1]: http://twiki.org/cgi-bin/view/Codev/TWikiSecurityAlertProcess
[2]: http://twiki.org/cgi-bin/view/Codev/TWikiRelease06x00x01
[3]: http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2014-9367 (will be created on 2014-12-18)
[4]: http://twiki.org/cgi-bin/view/Codev/TWikiSecurityMailingList
[5]: http://twiki.org/cgi-bin/view/Codev/TWikiAnnounceMailingList
[6]: http://twiki.org/cgi-bin/view/Codev/TWikiDevMailingList
[7]: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9367 - CVE on MITRE.org
[8]: http://develop.twiki.org/~twiki4/cgi-bin/view/Bugs/Item7596
---++ Feedback
Please provide feedback at the security alert topic, http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2014-9367 once it exists (this topic will be created on Thu, 2014-12-18).
Please send an e-mail to twi...@li... if you have any questions before Thursday.
-- Peter Thoeny - 2014-12-16
--
> Peter Thoeny - Peter09[at]Thoeny.org
> http://bit.ly/MrTWiki - consulting on enterprise collaboration
> http://TWiki.org - is your team already TWiki enabled?
> Knowledge cannot be managed, it can be discovered and shared
> This e-mail is: (_) private (_) ask first (x) public
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