CVE-2008-0620 in SAPSprint
Summary
by MITRE
SAPLPD 6.28 and earlier included in SAP GUI 7.10 and SAPSprint before 1018 allows remote attackers to cause a denial of service (crash) via a 0x53 LPD command, which causes the server to terminate.
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Analysis
by VulDB Data Team • 08/05/2019
The vulnerability identified as CVE-2008-0620 represents a critical denial of service flaw affecting SAPLPD 6.28 and earlier versions that were packaged within SAP GUI 7.10 and SAPSprint before version 1018. This issue specifically targets the Line Printer Daemon protocol implementation within SAP's printing services infrastructure, creating a condition where remote attackers can deliberately trigger system instability through crafted network commands. The vulnerability manifests when the affected system receives a 0x53 LPD command, which is a specific control code within the Line Printer Daemon protocol that should normally be handled gracefully by the print spooler service.
The technical exploitation of this vulnerability occurs at the protocol level where the SAPLPD service fails to properly validate incoming LPD commands before processing them. When a remote attacker sends a 0x53 command to the vulnerable SAPLPD service, the system's parsing logic encounters an unexpected condition that leads to an unhandled exception or memory corruption state. This failure mode causes the print daemon process to crash and terminate unexpectedly, resulting in a complete denial of service for printing capabilities within the SAP environment. The vulnerability stems from inadequate input validation and error handling mechanisms within the LPD protocol implementation, creating a path for malicious actors to disrupt business operations through simple network-based attacks.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments relying on SAP systems for business operations, particularly those with extensive printing infrastructure requirements. The denial of service condition affects not just individual print jobs but can potentially disrupt entire printing workflows across multiple users and applications within the SAP ecosystem. Organizations may experience production delays, workflow interruptions, and reduced productivity as printing services become unavailable. The remote nature of the attack means that threat actors can exploit this vulnerability from outside the corporate network without requiring local system access or credentials, making it particularly dangerous in environments with limited network segmentation. This vulnerability directly relates to CWE-20, which addresses improper input validation, and aligns with ATT&CK technique T1499.004 for network denial of service attacks.
The mitigation strategies for this vulnerability primarily involve applying the vendor-provided patches and updates that address the input validation issues within the SAPLPD service. Organizations should prioritize upgrading to SAP GUI 7.10 with SAPSprint 1018 or later versions that contain the necessary fixes for this vulnerability. Additionally, network administrators should implement firewall rules to restrict access to the affected LPD ports and consider implementing network segmentation to limit potential attack vectors. Monitoring and logging of LPD protocol traffic should be enhanced to detect unusual command patterns that might indicate attempted exploitation. Organizations should also consider disabling unnecessary LPD services if they are not actively used within their environment, reducing the attack surface for potential exploitation. The vulnerability highlights the importance of maintaining up-to-date SAP systems and implementing proper security controls around legacy printing protocols that may not receive ongoing security support.