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Q1 Factsheets released:

http://secunia.com/resources/factsheets/2011_vendor/


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TITLE:
MyBB Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA43937

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43937/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43937

RELEASE DATE:
2011-04-05

DISCUSS ADVISORY:
http://secunia.com/advisories/43937/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/43937/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=43937

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Two weaknesses and two vulnerabilities have been reported in MyBB,
which can be exploited by malicious users to conduct script insertion
attacks and by malicious people to enumerate usernames and conduct
cross-site scripting attacks.

1) The script xmlhttp.php (when "action" is set to
"username_availability" or "username_exists") returns different
messages depending on the existence of the provided username. This
can be exploited to enumerate valid usernames.

2) Input passed via the "value" parameter to xmlhttp.php (when
"action" is set to "username_exists") 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.

3) Input passed via thread subjects is not properly sanitised before
being displayed to the user when certain actions are performed. This
can be exploited to insert arbitrary HTML and script code, which will
be executed in a user's browser session in context of an affected site
when the malicious data is being viewed.

Successful exploitation of this vulnerability requires HTML in posts
to be enabled.

The weaknesses and the vulnerabilities are reported in versions prior
to 1.6.2.

SOLUTION:
Update to version 1.6.2.

PROVIDED AND/OR DISCOVERED BY:
1, 2) MustLive
3) The vendor credits Max Roth.

The vendor also credits MattRogowski.

ORIGINAL ADVISORY:
MyBB:
http://blog.mybb.com/2011/02/22/mybb-1-6-2-and-1-4-15-security-update/

MustLive:
http://websecurity.com.ua/4925/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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