Microsoft Internet Explorer setRequestHeader chunk security bypass
| ie-setrequestheader-chunk-security-bypass (42804) |  Medium Risk |
Description:
Microsoft Internet Explorer could allow a remote attacker to bypass security restrictions, caused by a failure in the setRequestHeader method of the XMLHttpRequest object method to prevent Transfer-Encoding HTTP header requests. By sending a specially-crafted HTTP POST request containing a "Transfer-Encoding: chunked" header and a request body with an incorrect chunk size, an attacker could exploit this vulnerability to conduct HTTP request splitting and smuggling attacks.
*CVSS:
| Base Score: | 2.6 |
| Access Vector: | Network |
| Access Complexity: | High |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 2 |
| Exploitability: | Proof-of-Concept |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Refer to Microsoft Security Bulletin MS08-031 for patch, upgrade or suggested workaround information. See References.
References:
- Microsoft Internet Explorer Web site: Internet Explorer: Home Page.
- Microsoft Web site: Microsoft Security Bulletin MS08-031.
- Minded Security Labs: Advisory #MSA01240108: Microsoft Internet Explorer "Transfer-Encoding: chunked" allows Request Splitting/Smuggling.
- BID-28379: Microsoft Internet Explorer 'setRequestHeader()' Multiple Vulnerabilities
- CVE-2008-1545: The setRequestHeader method of the XMLHttpRequest object in Microsoft Internet Explorer 7 does not restrict the dangerous Transfer-Encoding HTTP request header, which allows remote attackers to conduct HTTP request splitting and HTTP request smuggling attacks via a POST containing a Transfer-Encoding: chunked header and a request body with an incorrect chunk size.
- SA29453: Internet Explorer HTTP Request Smuggling/Splitting Vulnerabilities
- VUPEN/ADV-2008-0980: Microsoft Internet Explorer Request Splitting and Smuggling Vulnerabilities
Platforms Affected:
- Microsoft Internet Explorer 7.0.5730.11
Reported:
Mar 21, 2008
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.