| Business Impact: |
Microsoft Windows Media Player is an application that is installed with most modern Microsoft operating systems, such as Windows XP, Vista, 2000, and Server 2003. Although this vulnerability may require some user interaction, a successful exploit would result in remote code execution and possibly complete compromise of the system. The widespread nature of Windows Media Player coupled with the impact of the vulnerability means this issue should be considered highly critical. |
| CVSS for XFIDs 38827, 38828, 38829, 38830: |
Base Score: |
10.0 |
| |
Access Vector: |
Network |
| Access Complexity: |
Low |
| Authentication: |
None |
| Confidentiality Impact: |
Complete |
| Integrity Impact: |
Complete |
| Availability Impact: |
Complete |
| Impact Bias: |
None |
| Adjusted Temporal Score: |
7.4 |
| |
Exploitability: |
Unproven |
| Remediation Level: |
Official-Fix |
| Report Confidence: |
Confirmed |
| Affected Products: |
For a full list of affected versions, see references below. |
| Technical Description: |
.ASF is a file format that is processed by Windows Media Player. This file format contains three mandatory header objects and, sometimes, Stream Property entries. The four vulnerabilities in this advisory are related to the Stream Properties entries.
- Audio_conceal_none entry. This entry has a corresponding entry length that is an arbitrary short. It is possible to craft a length value which, after some addition and truncation, will result in a small buffer being allocated. If a large copy occurs, it will overflow the heap and possibly allow remote code execution. (XFID 38828)
- Degradable JPEG Media entry. This entry has a corresponding entry length that is an arbitrary short. It is possible to craft a length value which, after some addition and truncation, will result in a small buffer being allocated. If a large copy occurs, it will overflow the heap and possibly allow remote code execution. (XFID 38827)
- Error correction entry. This entry has a corresponding entry length that is an arbitrary short. It is possible to craft a length value which, after some addition and truncation, will result in a small buffer being allocated. If a large copy occurs, it will overflow the heap and possibly allow remote code execution. (XFID 38829)
-
The Stream Property entries may also contain both a type-specific data length and an error correction data length. Arithmetic is performed on these integers in order to arrive at the size of a chunk of memory to allocate. Due to a corner case in the arithmetic, if the two sizes are large enough, then a memory overflow may occur possibly leading to remote code execution (XFID 38830). |
| Remediation: |
Patches are available for this issue. See References for details. |
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