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securityvulnsSecurityvulnsSECURITYVULNS:DOC:17809
HistoryAug 16, 2007 - 12:00 a.m.

NSFOCUS SA2007-01 : Microsoft IE5 CSS Parsing Memory Corruption Vulnerability

2007-08-1600:00:00
vulners.com
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NSFOCUS Security Advisory (SA2007-01)

Microsoft IE5 CSS Parsing Memory Corruption Vulnerability

Release Date: 2007-08-15

CVE ID: CVE-2007-0943

http://www.nsfocus.com/english/homepage/research/0701.htm

Affected systems & software

Internet Explorer 5.01

Unaffected systems & software

Summary

NSFocus Security Team discovered a memory corruption vulnerability in IE 5
that allows arbitrary code execution when parsing a malicious CSS file.

Description

There exists a vulnerability when IE 5.0 parses CSS due to insufficient check
on the pointer. Out-of-bound pointer reference and memory overwriting might
occur in the handling of malformed CSS files, which allows attackers to run
arbitrary code via carefully crafted data.

Attackers can run arbitrary code by crafting a malicious WEB page and alluring
users to visit it. If the victim is an administrator, then attackers can gain
complete control over the system.

The system will be vulnerable even if the security level of IE is set to "High".

Workaround

Do not visit untrusted websites.

Vendor Status

2006.08.31 Informed the vendor
2006.09.01 Vendor confirmed the vulnerability
2007.08.14 Microsoft released MS07-045 to fix the vulnerability.

For more details about Microsoft Security Bulletin, please refer to:
http://www.microsoft.com/technet/security/bulletin/MS07-045.mspx

Additional Information

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-0943 to this issue. This is a candidate for inclusion in the
CVE list (http://cve.mitre.org), which standardizes names for security problems.
Candidates may change significantly before they become official CVE entries.

Acknowledgment

Hu Qianwei of NSFocus Security Team found the vulnerability.

DISCLAIMS

THE INFORMATION PROVIDED IS RELEASED BY NSFOCUS "AS IS" WITHOUT WARRANTY
OF ANY KIND. NSFOCUS DISCLAIMS ALL WARRANTIES, EITHER EXPRESSED OR IMPLIED,
EXCEPT FOR THE WARRANTIES OF MERCHANTABILITY. IN NO EVENT SHALL NSFOCUS
BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
INCIDENTAL,CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES,
EVEN IF NSFOCUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
DISTRIBUTION OR REPRODUCTION OF THE INFORMATION IS PROVIDED THAT THE
ADVISORY IS NOT MODIFIED IN ANY WAY.

Copyright 1999-2007 NSFOCUS. All Rights Reserved. Terms of use.

NSFocus Security Team <[email protected]>
NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
(http://www.nsfocus.com)

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