CVE-2012-1858 : Detail

CVE-2012-1858

A01-Broken Access Control
91.39%V3
Network
2012-06-12
20h00 +00:00
2018-10-12
17h57 +00:00
CVE.org
NVD
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CVE Descriptions

The toStaticHTML API (aka the SafeHTML component) in Microsoft Internet Explorer 8 and 9, Communicator 2007 R2, and Lync 2010 and 2010 Attendee does not properly handle event attributes and script, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted HTML document, aka "HTML Sanitization Vulnerability."

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Metrics

Metrics Score Severity CVSS Vector Source
V2 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 19777

Publication date : 2012-07-11 22h00 +00:00
Author : Adi Cohen
EDB Verified : Yes

toStaticHTML: The Second Encounter (CVE-2012-1858) *HTML Sanitizing Bypass - *CVE-2012-1858<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1858> Original advisory - http://blog.watchfire.com/wfblog/2012/07/tostatichtml-the-second-encounter-cve-2012-1858-html-sanitizing-information-disclosure-introduction-t.html Introduction The *toStaticHTML* component, which is found in Internet Explorer > 8, SharePoint and Lync is used to sanitize HTML fragments from dynamic and potentially malicious content. If an attacker is able to break the filtering mechanism and pass malicious code through this function, he/she may be able to perform HTML injection based attacks (i.e. XSS). It has been a year since the first encounter<http://blog.watchfire.com/wfblog/2011/07/tostatichtml-html-sanitizing-bypass.html> was published, we've now returned with a new bypass method. Vulnerability An attacker is able to create a specially formed CSS that will overcome * toStaticHTML*'s security logic; therefore, after passing the specially crafted CSS string through the *toStaticHTML* function, it will contain an expression that triggers a JavaScript call. The following JavaScript code demonstrates the vulnerability: *<script>document.write(toStaticHTML("<style> div{font-family:rgb('0,0,0)'''}foo');color=expression(alert(1));{} </style><div>POC</div>"))</script>* In this case the function's return value would be JavaScript executable: *<style> div{font-family:rgb('0,0,0)''';}foo');color=expression(alert(1));{;}</style> <div>POC</div>* The reason this code bypasses the filter engine is due to two reasons: 1. The filtering engine allows the string "expression(" to exists in "non-dangerous" locations within the CSS. 2. A bug in Internet Explorer's CSS parsing engine doesn't properly terminate strings that are opened inside brackets and closed outside of them. When combining these two factors the attacker is able to "confuse" the filtering mechanism into "thinking" that a string is open when in fact it is terminated and vice versa. With this ability the attacker can trick the filtering mechanism into entering a state of the selector context which is considered safer where in fact the code is just a new declaration of the same selector, thus breaking the state machine and bypassing the filter. Impact Every application that relies on the *toStaticHTML* component to sanitize user supplied data had probably been vulnerable to XSS. Remediation Microsoft has issued several updates to address this vulnerability. MS12-037 - http://technet.microsoft.com/en-us/security/bulletin/ms12-037 MS12-039 - http://technet.microsoft.com/en-us/security/bulletin/ms12-039 MS12-050 - http://technet.microsoft.com/en-us/security/bulletin/MS12-050

Products Mentioned

Configuraton 0

Microsoft>>Lync >> Version 2010

Microsoft>>Lync >> Version 2010

Microsoft>>Lync >> Version 2010

Microsoft>>Office_communicator >> Version 2007

Configuraton 0

Microsoft>>Internet_explorer >> Version 8

Microsoft>>Windows_2003_server >> Version *

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_server_2003 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_vista >> Version *

Microsoft>>Windows_xp >> Version *

Microsoft>>Windows_xp >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 9

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_vista >> Version *

Microsoft>>Windows_vista >> Version -

References

http://www.us-cert.gov/cas/techalerts/TA12-192A.html
Tags : third-party-advisory, x_refsource_CERT
http://www.us-cert.gov/cas/techalerts/TA12-164A.html
Tags : third-party-advisory, x_refsource_CERT