Novell ZenWorks Handheld Management Unicode String Parsing Integer Overflow Vulnerability
ZenWorks Handheld Management is used to configure, deploy, and manage handheld devices in the enterprise environment. It provides provisioning and management support for a number of smartphone devices. For more information see the following link on the vendor's website.
Remote exploitation of an integer overflow vulnerability in Novell Inc.'s ZenWorks Handheld Management could allow an attacker to execute arbitrary code with the privileges of the affected service.
The vulnerability occurs when the ZENworks Handheld Management Server process parses a malformed request with the 0x2a opcode. This opcode contains various Unicode strings as parameters. Each string is stored with either an 8bit or 16bit length. When reading in these strings, the vulnerable code sign extends the length value to 32 bits, and then adds 2 to the result. This calculation can overflow, which results in an undersized buffer being allocated. The buffer is then overflowed with data from the packet, which can corrupt heap structures and lead to the execution of arbitrary code.
Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service, usually SYSTEM. In order to exploit this vulnerability, an attacker needs the ability to connect to the target on TCP port 2398 (or whatever port the service has been configured to listen on if the default has been changed). No authentication is necessary.
iDefense has confirmed the existence of this vulnerability in ZenWorks Handheld Management version 18.104.22.168213.
iDefense is currently unaware of any workaround for this issue.
Novell has released patches and workarounds to address this vulnerability. For more information, consult their advisory at the following URL.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-2656 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
07/13/2011 Initial Vendor Notification
07/13/2011 Initial Vendor Reply
10/18/2011 Coordinated Public Disclosure
This vulnerability was reported to iDefense by Luigi Auriemma.
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