CVE-2003-1332 in Samba
Summary
by MITRE
Stack-based buffer overflow in the reply_nttrans function in Samba 2.2.7a and earlier allows remote attackers to execute arbitrary code via a crafted request, a different vulnerability than CVE-2003-0201.
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Analysis
by VulDB Data Team • 06/29/2021
The vulnerability identified as CVE-2003-1332 represents a critical stack-based buffer overflow within the Samba file sharing implementation that affects versions 2.2.7a and earlier. This flaw exists specifically within the reply_nttrans function, which handles network transparent transactions in the Server Message Block protocol. The vulnerability stems from inadequate input validation and bounds checking when processing crafted network requests, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on vulnerable systems. The flaw is distinct from CVE-2003-0201, indicating separate attack vectors and exploitation mechanisms within the Samba codebase. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent stack memory locations. The attack requires a remote malicious actor to send a specially crafted SMB request that triggers the vulnerable code path, making it particularly dangerous in networked environments where Samba servers are accessible to untrusted users.
The technical implementation of this vulnerability occurs when the reply_nttrans function processes incoming network data without proper validation of the buffer sizes or data lengths. When an attacker sends a malformed request containing oversized data structures, the function fails to check whether the incoming data exceeds the allocated stack buffer space. This lack of bounds checking allows the attacker to overwrite adjacent memory locations including return addresses, function pointers, and other critical control data. The exploitation process typically involves carefully crafting the malicious input to overwrite the instruction pointer or return address on the stack, redirecting execution flow to payload code injected by the attacker. The vulnerability's impact extends beyond simple code execution to potentially allow full system compromise, privilege escalation, and unauthorized access to sensitive data stored on the affected Samba servers. From an operational perspective, this vulnerability affects any organization running vulnerable Samba versions, particularly those with network-accessible file sharing services, making it a high-priority security concern for enterprise environments.
Organizations affected by CVE-2003-1332 must implement immediate mitigation strategies to protect their systems from exploitation. The primary remediation involves upgrading to Samba versions 2.2.8a or later, where the buffer overflow vulnerability has been patched and proper input validation has been implemented. System administrators should also consider implementing network segmentation and access controls to limit exposure of Samba services to untrusted networks. Additionally, monitoring network traffic for suspicious SMB requests and implementing intrusion detection systems can help identify potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1210, which involves exploitation of remote services through buffer overflow conditions. Organizations should also conduct comprehensive vulnerability assessments to identify all instances of vulnerable Samba installations within their infrastructure. Security teams should develop incident response procedures specific to this vulnerability type, including system isolation protocols, forensic analysis capabilities, and coordinated patch management processes. The remediation process must be carefully managed to avoid service disruptions while ensuring complete protection against this and related vulnerabilities in the Samba codebase.