CVE-2012-1009 in Xlpd
Summary
by MITRE
NetSarang Xlpd 4 Build 0100 and NetSarang Xmanager Enterprise 4 Build 0186 allow remote attackers to cause a denial of service (daemon crash) via a malformed LPD request.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2012-1009 affects NetSarang Xlpd version 4 Build 0100 and NetSarang Xmanager Enterprise 4 Build 0186, both of which are part of the NetSarang suite of network management tools. These applications implement the Line Printer Daemon protocol, which is a standard network protocol used for managing print jobs and printer queues on networked systems. The LPD protocol operates on TCP port 515 and is commonly used in Unix-like systems for printer management. The vulnerability resides in how these applications handle incoming LPD requests, specifically when processing malformed packets that do not conform to the expected protocol structure.
This vulnerability represents a classic buffer overflow condition or improper input validation flaw that allows remote attackers to craft specially malformed LPD requests designed to trigger an application crash. The technical implementation appears to lack proper bounds checking or input sanitization when parsing incoming network data, causing the daemon process to terminate unexpectedly when encountering malformed data structures. The flaw is classified as a denial of service condition because it enables an attacker to remotely disrupt the availability of the printing services provided by these applications, effectively preventing legitimate users from accessing printer functionality.
The operational impact of this vulnerability is significant for organizations relying on these NetSarang applications for network printing management. When exploited, the vulnerability can cause the LPD daemon to crash repeatedly, leading to complete service disruption for print services within the network. This affects not only the immediate availability of printers but can also impact network infrastructure management, as administrators may need to manually restart services or investigate system crashes. The vulnerability is particularly concerning because it allows remote exploitation without requiring authentication, making it an attractive target for attackers seeking to disrupt network operations. According to the Common Weakness Enumeration catalog, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and potentially CWE-122 for stack-based buffer overflows depending on implementation details.
The attack surface for this vulnerability extends beyond simple disruption as it can be leveraged as part of broader network compromise strategies. From an adversary perspective, this represents a low-effort method to gain initial access to network infrastructure or to create a distraction while conducting more sophisticated attacks. The vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks. Organizations using these applications should implement immediate mitigations including network segmentation to isolate affected systems, firewall rules to block unnecessary LPD traffic, and application-level monitoring to detect exploitation attempts. Additionally, patch management should be prioritized to ensure affected versions are updated to patched releases that properly validate incoming LPD requests and implement appropriate input sanitization measures to prevent the malformed data from causing daemon crashes.