CVE-2003-0774 in SANE
Summary
by MITRE
saned in sane-backends 1.0.7 and earlier does not quickly handle connection drops, which allows remote attackers to cause a denial of service (segmentation fault) when invalid memory is accessed.
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Analysis
by VulDB Data Team • 06/12/2019
The vulnerability identified as CVE-2003-0774 affects the saned daemon component within sane-backends version 1.0.7 and earlier implementations. This daemon serves as the network scanner daemon that enables remote access to scanner devices through the Simple Network Management Protocol. The flaw resides in how the saned service manages network connections and handles abrupt disconnections from client applications. When a client establishes a connection to the saned daemon and subsequently drops the connection without proper termination procedures, the daemon fails to properly handle this scenario, leading to improper memory management and subsequent segmentation faults. This behavior represents a classic denial of service vulnerability where legitimate service operations are disrupted through improper resource handling.
The technical root cause of this vulnerability stems from inadequate error handling mechanisms within the saned daemon's connection management code. When a client connection is abruptly terminated, the daemon does not properly validate or clean up associated memory structures before attempting to process subsequent operations. This deficiency allows attackers to exploit the service by establishing connections and then immediately disconnecting, which triggers memory access violations. The vulnerability specifically manifests as a segmentation fault during memory access operations, indicating that the daemon attempts to read from or write to memory locations that have already been freed or are otherwise inaccessible. This type of memory corruption vulnerability falls under the CWE-125 vulnerability category, which deals with out-of-bounds read conditions, and also aligns with CWE-476 which addresses null pointer dereference scenarios.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall stability of systems running affected sane-backends implementations. Remote attackers can exploit this vulnerability to repeatedly cause the saned daemon to crash, resulting in denial of service for legitimate scanner access requests. This creates a persistent availability issue that affects users attempting to access networked scanning services, particularly in environments where centralized scanning services are critical for document management workflows. The vulnerability is particularly concerning in enterprise environments where multiple users may simultaneously access network scanners through the saned daemon, as a single malicious connection attempt could disrupt service for all users. Additionally, the segmentation fault behavior could potentially be exploited to execute arbitrary code or cause further system instability, though the primary impact remains focused on denial of service conditions.
Mitigation strategies for CVE-2003-0774 should prioritize immediate patching of affected sane-backends installations to version 1.0.8 or later, which includes proper connection handling and memory management fixes. System administrators should also implement network-level monitoring to detect unusual connection patterns that may indicate exploitation attempts, particularly focusing on rapid connection establishment and termination sequences. Network segmentation and access controls should be enforced to limit exposure of the saned daemon to untrusted networks, while implementing proper firewall rules to restrict access to the daemon's listening ports. The ATT&CK framework categorizes this vulnerability under the T1499.004 technique for network denial of service, emphasizing the importance of implementing proper input validation and connection state management. Organizations should also establish regular vulnerability assessment procedures to identify and remediate similar memory management issues in other network services, as this vulnerability demonstrates the critical importance of robust error handling in daemon implementations. Additionally, implementing process monitoring and automatic restart mechanisms for the saned daemon can help maintain service availability during exploitation attempts, though this represents a temporary workaround rather than a permanent fix.