CVE-2007-5331 in BrightStor ARCServe BackUp
Summary
by MITRE
Queue.dll for the message queuing service (LQserver.exe) in CA BrightStor ARCServe BackUp v9.01 through R11.5, and Enterprise Backup r10.5, allows remote attackers to execute arbitrary code via a malformed ONRPC protocol request for operation 0x76, which causes ARCserve Backup to dereference arbitrary pointers.
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Analysis
by VulDB Data Team • 07/27/2019
The vulnerability described in CVE-2007-5331 represents a critical buffer overflow condition within the Queue.dll component of CA BrightStor ARCServe Backup software. This flaw exists within the message queuing service implementation where the LQserver.exe process handles incoming ONRPC protocol requests. The vulnerability specifically manifests when processing operation 0x76 within the ONRPC protocol stack, creating a scenario where remote attackers can manipulate the software's memory management through crafted malformed requests. The flaw stems from insufficient input validation and bounds checking within the protocol handler, allowing attackers to supply malicious data that triggers pointer dereference operations on arbitrary memory locations. This particular vulnerability falls under the CWE-121 category of stack-based buffer overflow, though the implementation specifics suggest more complex memory corruption patterns typical of heap-based vulnerabilities. The ONRPC protocol implementation fails to properly validate the length and structure of incoming requests, enabling attackers to overwrite critical memory structures and potentially execute arbitrary code with the privileges of the running service.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise when exploited successfully. Attackers leveraging this vulnerability can gain unauthorized access to backup servers running affected versions of CA BrightStor ARCServe Backup, potentially leading to data theft, system takeover, and disruption of critical backup operations. The remote nature of the attack means that adversaries do not require physical access or local network presence to exploit the vulnerability, making it particularly dangerous in enterprise environments where backup servers often maintain elevated privileges and access to sensitive data repositories. The exploitation of this vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter execution, as successful exploitation would likely involve executing malicious code within the backup server's security context. The attack surface is further expanded due to the nature of backup systems, which typically operate continuously and may be accessible from multiple network segments, providing attackers with persistent access points for further lateral movement within the enterprise network.
Mitigation strategies for CVE-2007-5331 should prioritize immediate patching of affected systems with vendor-provided security updates. Organizations should implement network segmentation to isolate backup servers from general network traffic, reducing the attack surface available to remote adversaries. Access controls should be strengthened through the implementation of authentication mechanisms and firewall rules that restrict access to the affected services to only trusted network segments and IP addresses. Security monitoring should be enhanced to detect anomalous ONRPC protocol traffic patterns that may indicate exploitation attempts, with particular attention to unusual operation 0x76 requests. The vulnerability's characteristics suggest that traditional antivirus solutions may not effectively detect exploitation attempts, making behavioral monitoring and network-based intrusion detection systems essential components of the defensive strategy. Organizations should also consider implementing network access control lists that restrict communication with the affected LQserver.exe service to only necessary backup clients and management systems. System hardening measures including disabling unnecessary services, implementing least privilege principles for backup service accounts, and conducting regular vulnerability assessments should complement these technical controls. The remediation process should include thorough testing of patches in controlled environments before deployment to production systems, as backup server environments often contain critical business data and require careful change management procedures to avoid service disruption during the update process.