Secunia Security Advisory - Four vulnerabilities have been reported in Microsoft .NET Framework, which can be exploited by malicious people to cause a DoS (Denial of Service), conduct spoofing attacks, or bypass certain security restrictions.
4d893e59b9c1cbbbeb9cb4b05bd8e43586e4b79fb7dfa422f8d144817d5170b2
----------------------------------------------------------------------
Secunia is hiring!
Find your next job here:
http://secunia.com/company/jobs/
----------------------------------------------------------------------
TITLE:
Microsoft .NET Framework Multiple Vulnerabilities
SECUNIA ADVISORY ID:
SA47323
VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47323/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47323
RELEASE DATE:
2011-12-29
DISCUSS ADVISORY:
http://secunia.com/advisories/47323/#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/47323/
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=47323
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:
Four vulnerabilities have been reported in Microsoft .NET Framework,
which can be exploited by malicious people to cause a DoS (Denial of
Service), conduct spoofing attacks, or bypass certain security
restrictions.
1) An error within ASP.NET when hashing form posts and updating a
hash table can be exploited to cause a hash collision resulting in
high CPU consumption via a specially crafted form sent in a HTTP POST
request.
Successful exploitation of this vulnerability requires that a site
allows "application/x-www-form-urlencoded" or "multipart/form-data"
HTTP content types.
2) An error in the verification of return URLs during the forms
authentication process can be exploited to redirect a user to an
arbitrary website without the user's knowledge to e.g. conduct
phishing attacks.
Successful exploitation of this vulnerability requires that "Forms
Authentication" is configured per-application to be enabled.
3) An error in the authentication process when handling specially
crafted usernames can be exploited to access arbitrary users'
accounts to an ASP.NET application via a specially crafted web
request.
Successful exploitation of this vulnerability requires that "Forms
Authentication" is configured per-application to be enabled and that
a user can register an account on the ASP.NET application and knows
of a target user's account name.
4) An error in the handling of cached content when "Forms
Authentication" is used with sliding expiry can be exploited to
execute arbitrary commands in context of a target user tricked into
following a specially crafted link.
Successful exploitation of this vulnerability requires that ASP.NET
responses are cached through use of the "OutputCache" directive.
SOLUTION:
Apply patches.
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
PROVIDED AND/OR DISCOVERED BY:
1) Alexander Klink, n.runs AG and Julian Wälde, Technische
Universität Darmstadt.
2-4) Reported by the vendor.
ORIGINAL ADVISORY:
MS11-100 (KB2638420, KB2656351, KB2656352, KB2656353, KB2656355,
KB2656356, KB2656358, KB2656362, KB2657424):
http://technet.microsoft.com/en-us/security/bulletin/MS11-100
n.runs (SA-2011.004):
http://www.nruns.com/_downloads/advisory28122011.pdf
OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
----------------------------------------------------------------------
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.
Subscribe:
http://secunia.com/advisories/secunia_security_advisories/
Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/
Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.
----------------------------------------------------------------------