CVE-2010-0359 in Zeus Web Server
Summary
by MITRE
Buffer overflow in the SSLv2 support in Zeus Web Server before 4.3r5 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via a long string in an invalid Client Hello message.
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Analysis
by VulDB Data Team • 04/11/2025
The vulnerability identified as CVE-2010-0359 represents a critical buffer overflow flaw within the SSLv2 implementation of the Zeus Web Server software. This issue affects versions prior to 4.3r5 and demonstrates a classic security weakness where insufficient input validation leads to memory corruption. The vulnerability specifically manifests when the web server processes malformed SSLv2 Client Hello messages containing excessively long strings, creating conditions where attacker-controlled data exceeds the allocated buffer space. This flaw operates at the protocol level where SSLv2 support is implemented, making it particularly dangerous as it can be triggered through standard network communication patterns without requiring special privileges or authentication.
The technical exploitation of this vulnerability occurs through the manipulation of SSLv2 Client Hello messages sent to the affected web server. When a malformed message containing an oversized string is received, the server's SSLv2 handling code fails to properly validate the input length before copying it into a fixed-size buffer. This buffer overflow condition results in memory corruption that can cause the web server daemon to crash immediately, leading to denial of service. However, the vulnerability presents additional security implications beyond simple service disruption, as the memory corruption may potentially allow remote code execution if the overflow can be carefully crafted to overwrite critical program control structures. The flaw aligns with CWE-121 which describes heap-based buffer overflow conditions, and represents a specific implementation weakness in the SSL protocol handling layer.
From an operational perspective, this vulnerability creates significant risk for organizations relying on Zeus Web Server for web hosting services, particularly those handling sensitive data or operating mission-critical applications. The remote exploitability means that attackers can trigger the vulnerability from anywhere on the network without requiring physical access or local credentials, making it highly dangerous for public-facing web servers. The potential for both denial of service and arbitrary code execution creates a dual threat scenario where attackers can either disrupt services or gain unauthorized access to the server environment. Organizations may experience service interruptions, data exposure, and potential compromise of the entire server infrastructure if this vulnerability remains unpatched.
The mitigation strategy for CVE-2010-0359 primarily involves upgrading the Zeus Web Server to version 4.3r5 or later, which contains the necessary code fixes to properly validate SSLv2 Client Hello message lengths. System administrators should also consider disabling SSLv2 support entirely on affected systems, as this protocol version is considered deprecated and insecure due to multiple known vulnerabilities. Network-level protections such as intrusion detection systems can be configured to monitor for suspicious SSLv2 Client Hello patterns, though this represents a reactive approach rather than a complete solution. The vulnerability demonstrates the importance of proper input validation and buffer management in network services, aligning with ATT&CK technique T1203 which covers exploitation of software vulnerabilities for privilege escalation and remote code execution. Organizations should implement comprehensive patch management procedures to ensure timely deployment of security updates and maintain up-to-date inventory of all web server installations to prevent similar vulnerabilities from affecting their infrastructure.