iDefense Security Advisory 02.22.07 - Local exploitation of a multiple vulnerabilities in IBM Corp.'s DB2 Universal Database allow attackers to cause a denial of service condition or elevate privileges to root. Several vulnerabilities exist due to unsafe file access from within several setuid-root binaries. Specifically, when supplying certain environment variables, the DB2 administration binaries will use the specified filename for saving data. This allows an attacker to create or append to arbitrary files as root. A heap-based buffer overflow vulnerability can occur when copying data from an environment variable. The variable contents are copied to a static BSS segment buffer without ensuring proper NUL termination. Consequently, this allows an attacker to cause a heap overflow in a later function call. A stack-based buffer overflow can occur when an environment variable contains a long string. By specifying a specially crafted value, it is possible to overwrite the return address of a function and execute arbitrary code. iDefense has confirmed the existence of these vulnerabilities within IBM Corp.'s DB2 Universal Database 9.1 release installed on Linux. Other versions, including those installed on other architectures, are suspected to be vulnerable as well. These vulnerabilities do not appear to affect DB2 Universal Database running on the windows platform.
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