CVE-2007-3625 in Presentation Server
Summary
by MITRE
The Program Neighborhood Agent in Citrix Presentation Server Clients for 32-bit Windows before 10.100 allows remote attackers to cause a denial of service (agent exit) via a certain request that uses content redirection and a long pathname.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2007-3625 affects the Program Neighborhood Agent component within Citrix Presentation Server Clients for 32-bit Windows systems prior to version 10.100. This flaw represents a significant security concern as it enables remote attackers to execute a denial of service attack against targeted systems. The vulnerability specifically manifests when the agent processes certain requests that employ content redirection mechanisms combined with excessively long pathnames, ultimately causing the agent to terminate unexpectedly and exit the system process.
The technical exploitation of this vulnerability involves crafting malicious requests that leverage the content redirection functionality of the Citrix client software while simultaneously incorporating pathnames that exceed acceptable length limits. This combination triggers a buffer overflow condition or memory corruption within the Program Neighborhood Agent process, leading to its abrupt termination. The flaw resides in the agent's insufficient input validation and boundary checking mechanisms when handling pathname data during content redirection operations. According to CWE classification, this vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios that can occur when processing malformed input data.
The operational impact of this vulnerability extends beyond simple service disruption, as it can effectively render Citrix client sessions unusable and compromise the availability of critical business applications. Organizations relying on Citrix Presentation Server environments face potential productivity losses and service interruptions when attackers exploit this weakness. The remote nature of the attack means that threat actors can initiate the denial of service condition from external network positions without requiring local system access or authentication credentials. This characteristic significantly increases the attack surface and makes the vulnerability particularly dangerous in enterprise environments where Citrix solutions are widely deployed.
Mitigation strategies for CVE-2007-3625 primarily focus on implementing the official security patches released by Citrix for affected versions of their Presentation Server Clients. Organizations should prioritize upgrading to Citrix Presentation Server Client version 10.100 or later, which includes the necessary fixes for this vulnerability. Network-level protections can also be implemented through firewall rules that limit access to the affected agent services and monitor for suspicious pathname patterns in network traffic. Additionally, security monitoring should include detection of abnormal agent process termination events and unusual content redirection requests that may indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to the T1499.004 technique related to network denial of service attacks and represents a potential entry point for more sophisticated attacks that could leverage the service disruption as a foothold for additional compromise activities.