CVE-2008-0107

Desbordamiento inferior de enteros en SQL Server versiones 7.0 SP4, 2000 SP4, 2005 SP1 y SP2, 2000 Desktop Engine (MSDE 2000) SP4, 2005 Express Edition SP1 y SP2 y 2000 Desktop Engine (WMSDE); Microsoft Data Engine (MSDE) versión 1.0 SP4; y Internal Database (WYukon) SP2, permite a los usuarios autenticados remotos ejecutar código arbitrario por medio de un (1) SMB o (2) pathname de WebDAV para un archivo en disco (también se conoce como archivo de copia de seguridad almacenada) con un valor de tamaño de registro creado, que desencadena un desbordamiento de búfer basado en la región heap de la memoria, también se conoce como "SQL Server Memory Corruption Vulnerability"

Remote exploitation of an integer underflow vulnerability within Microsoft Corp.'s SQL Server could allow a remote attacker to execute arbitrary code with the privileges of the SQL Server. The vulnerability exists within the code responsible for parsing a stored backup file. A 32-bit integer value, representing the size of a record, is taken from the file and used to calculate the number of bytes to read into a heap buffer. This calculation can underflow, which leads to insufficient memory being allocated. The buffer is subsequently overfilled leading to an exploitable condition. iDefense confirmed the existence of this vulnerability in Microsoft SQL Server 2005 Service Pack 2 Hot Fix 4. Additional tests against SQL Server 2005 without any updates suggest it is also vulnerable. Previous versions are also suspected to be vulnerable.