CVE-2006-5171 in Protection Suites
Summary
by MITRE
Stack-based buffer overflow in the RPC interface in Mediasvr.exe in Computer Associates (CA) Brightstor ARCserve Backup 9.01 through 11.5, Enterprise Backup 10.5, and CA Protection Suites r2 allows remote attackers to execute arbitrary code via crafted SUNRPC packets, aka the "Mediasvr.exe Overflow," a different vulnerability than CVE-2006-5172.
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Analysis
by VulDB Data Team • 07/13/2019
The CVE-2006-5171 vulnerability represents a critical stack-based buffer overflow flaw discovered in the RPC interface of Mediasvr.exe component within Computer Associates Brightstor ARCserve Backup software versions ranging from 9.01 through 11.5, along with Enterprise Backup 10.5 and CA Protection Suites r2. This vulnerability specifically affects the mediasvr.exe process which handles remote procedure calls through the SUNRPC protocol, creating a significant attack surface that remote adversaries can exploit to gain unauthorized system control. The flaw stems from inadequate input validation within the RPC interface implementation, allowing attackers to craft malicious SUNRPC packets that trigger memory corruption when processed by the vulnerable software components.
The technical exploitation of this vulnerability occurs through a classic stack buffer overflow mechanism where attacker-controlled data exceeds the bounds of a fixed-size buffer allocated on the stack. When the RPC interface processes crafted SUNRPC packets containing oversized data payloads, the buffer overflow corrupts adjacent memory locations including return addresses and function pointers, enabling attackers to redirect execution flow to malicious code injected into the process memory space. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow as defined in the Common Weakness Enumeration catalog, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking permits data to overwrite adjacent memory locations.
The operational impact of CVE-2006-5171 extends beyond simple remote code execution, as it provides attackers with the capability to completely compromise the affected systems running vulnerable CA backup software. Successful exploitation can lead to full system takeover, allowing attackers to establish persistent backdoors, escalate privileges, and potentially move laterally within network environments where backup servers are deployed. The vulnerability's remote exploitability makes it particularly dangerous as attackers need only access to the network segment hosting the vulnerable backup servers to launch attacks, without requiring physical access or local credentials. This characteristic aligns with ATT&CK technique T1210 for exploiting remote services and T1059 for command and scripting interpreter usage, representing a significant threat to enterprise backup infrastructure security.
Organizations affected by this vulnerability should implement immediate mitigations including applying the vendor-provided patches released in response to this CVE, restricting network access to backup servers through firewall rules, and implementing network segmentation to isolate critical backup infrastructure from general network traffic. Additionally, security monitoring should be enhanced to detect suspicious RPC traffic patterns and anomalous behavior in backup server processes. The vulnerability demonstrates the importance of proper input validation in network services and highlights how legacy backup systems can contain critical security flaws that persist across multiple software versions, emphasizing the need for comprehensive vulnerability management programs that include regular security assessments of critical infrastructure components.