Citrix Provisioning Services Buffer Overflow (Jul 8, 2011)

Citrix Provisioning Services is a workload (operating system, application, and configuration) management system. It maximizes flexibility of hardware resources by making no software preloaded on the systems; instead, computers will obtain application from the network in real-time. A proprietary communication protocol is used between the Provisioning Server and other components.

Several buffer overflow vulnerabilities exist in the Citrix Provisioning Services. Specifically, the vulnerabilities are due to insufficient validation of data sent to the streamprocess.exe, which listens on port 6905/udp. An attacker can exploit these vulnerabilities by sending crafted packets to the target server. Successful exploitation would allow for arbitrary code injection and execution with the privileges of the streamprocess.exe. Code injection that does not result in execution would terminate the service due to memory corruption.

SonicWALL has released several IPS signatures to detect and block known exploits targeting these vulnerabilities. The signatures are listed below:

6346 - Citrix Provisioning Services Buffer Overflow 1

6794 - Citrix Provisioning Services Buffer Overflow 2

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.