avast! antivirus SIS buffer overflow
| avast-sis-bo (34501) |  High Risk |
Description:
avast! antivirus is vulnerable to a heap-based buffer overflow, caused by improper bounds checking when parsing SIS files. By creating a specially-crafted SIS file, a remote attacker could overflow a buffer and execute arbitrary code on the system, if the attacker could persuade the victim to open the malicious file.
*CVSS:
| Base Score: | 5.6 |
| Access Vector: | Remote |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 4.1 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Upgrade to the latest version of avast! antivirus (4.7.700 or later), available from the avast! antivirus Web site. See References.
References:
- avast! antivirus Web site: avast! antivirus software - computer virus, worm and Trojan protection by ALWIL Software.
- Full-Disclosure Mailing List, Fri May 25 2007 - 02:02:26 CDT: n.runs-SA-2007.009 - Avast! Antivirus SIS parsing Arbitrary Code Execution Advisory.
- BID-24155: Avast! Managed Client SIS File Handling Remote Heap Overflow Vulnerability
- CVE-2007-2846: Heap-based buffer overflow in the SIS unpacker in avast! Anti-Virus Managed Client before 4.7.700 allows user-assisted remote attackers to execute arbitrary code via a crafted SIS archive, resulting from an integer cast around.
- US-CERT VU#125868: Avast! antivirus buffer overflow vulnerability
- VUPEN/ADV-2007-1935: avast! Server and Managed Client CAB and SIS Parsing Heap Overflow Vulnerabilities
Platforms Affected:
- Alwil avast! prior to 4.7.700
Reported:
May 25, 2007
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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.