CVE-2011-4791 in Data Protector Media Operations
Summary
by MITRE
DBServer.exe in HP Data Protector Media Operations 6.11 and earlier allows remote attackers to execute arbitrary code via a crafted request containing a large value in a length field.
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Analysis
by VulDB Data Team • 11/29/2021
The vulnerability identified as CVE-2011-4791 affects HP Data Protector Media Operations version 6.11 and earlier, specifically targeting the DBServer.exe component. This issue represents a critical buffer overflow condition that can be exploited remotely to achieve arbitrary code execution on affected systems. The flaw manifests when the application processes a specially crafted request containing an excessively large value in a length field, which leads to memory corruption and potential system compromise. The vulnerability falls under the category of improper input validation and memory management issues that have been consistently categorized by CWE as CWE-121, which addresses stack-based buffer overflow conditions. The attack vector is particularly concerning as it enables remote exploitation without requiring authentication, making it accessible to any attacker who can send network requests to the vulnerable service. This vulnerability directly aligns with tactics described in the MITRE ATT&CK framework under T1203, which covers legitimate credentials and T1059, covering command and scripting interpreter, as successful exploitation would allow attackers to execute malicious code with the privileges of the affected service. The impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for further network penetration and lateral movement within enterprise environments where HP Data Protector is deployed. Organizations using this software are particularly at risk since the vulnerability affects a core component of data protection infrastructure, potentially allowing attackers to gain access to sensitive backup data and system credentials stored within the media operations environment.
The technical exploitation of CVE-2011-4791 relies on the application's failure to properly validate length fields in incoming requests, leading to a classic buffer overflow scenario where attacker-controlled data overflows into adjacent memory regions. When DBServer.exe receives a malformed request with an oversized length parameter, the application's memory allocation routines fail to handle the excessive data size appropriately, causing memory corruption that can be leveraged to overwrite critical program execution pointers or return addresses. This type of vulnerability is particularly dangerous in enterprise backup environments where the Data Protector Media Operations service typically runs with elevated privileges to manage backup operations and access sensitive data. The vulnerability's remote nature means that attackers can exploit it from outside the organization's network perimeter, potentially bypassing traditional network segmentation controls. The flaw demonstrates characteristics consistent with CWE-787, which addresses out-of-bounds write conditions, and represents a significant weakness in the application's input sanitization and memory management practices. The exploitation process would typically involve crafting a malicious request packet with carefully calculated oversized length values that cause the buffer overflow to redirect execution flow to attacker-controlled code, potentially allowing for remote command execution and system compromise. This vulnerability represents a fundamental failure in secure coding practices, specifically in the areas of input validation and memory boundary checking that are essential requirements for defensive programming as outlined in industry best practices.
The operational impact of CVE-2011-4791 extends far beyond immediate system compromise, as it provides attackers with persistent access to critical backup infrastructure that often contains sensitive organizational data. Organizations that fail to patch this vulnerability face potential data loss, unauthorized access to backup repositories, and possible disruption of backup operations that could prevent recovery from legitimate disasters. The vulnerability's presence in HP Data Protector Media Operations creates a significant risk for enterprises that rely on this software for their backup and disaster recovery operations, as attackers could potentially manipulate backup data, delete critical backups, or gain access to credentials stored within the backup environment. The exploitability of this vulnerability means that organizations cannot assume their backup infrastructure is secure, as the attack surface includes the network-facing components of the backup system. This vulnerability also has implications for compliance requirements, as many regulatory frameworks mandate protection of backup data and systems, and the presence of such a critical vulnerability could result in compliance violations and potential regulatory penalties. The attack scenario would likely involve an attacker identifying the vulnerable service, crafting the appropriate malicious request, and then executing commands on the target system to gain unauthorized access to backup data and potentially escalate privileges within the organization's backup infrastructure. The vulnerability's classification as a remote code execution flaw means that organizations must consider both internal and external threat vectors, as attackers could exploit it from anywhere on the internet.
Organizations should implement immediate mitigation strategies to address CVE-2011-4791, beginning with the application of HP's official security patches and updates for Data Protector Media Operations. The recommended approach includes deploying network segmentation controls to isolate the vulnerable service from untrusted networks and implementing network access controls to restrict access to the affected port and service. System administrators should also consider disabling the vulnerable service if it is not essential for operations, or implementing additional monitoring and logging to detect potential exploitation attempts. The vulnerability's characteristics align with the need for comprehensive defensive measures that include both perimeter defense and internal network monitoring, as described in the NIST Cybersecurity Framework and other industry standards for secure system administration. Organizations should also conduct vulnerability assessments to identify other potentially vulnerable components within their backup infrastructure and ensure that all systems are running patched and up-to-date versions of HP Data Protector software. The mitigation strategy must account for the fact that this vulnerability affects a core component of backup operations, so any security measures must balance protection with operational requirements to maintain business continuity. Regular security assessments and penetration testing should be conducted to verify that the implemented controls are effective and to identify any additional vulnerabilities that may exist within the backup infrastructure or related systems. Given the nature of the vulnerability, organizations should also review their incident response procedures to ensure they can quickly detect and respond to exploitation attempts, as the remote nature of the attack means that detection may be more challenging than local privilege escalation vulnerabilities.