CVE-2003-1118 in SETI@home
Summary
by MITRE
Buffer overflow in the SETI@home client 3.03 and other versions allows remote attackers to cause a denial of service (client crash) and execute arbitrary code via a spoofed server response containing a long string followed by a \n (newline) character.
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Analysis
by VulDB Data Team • 11/19/2024
The vulnerability identified as CVE-2003-1118 represents a critical buffer overflow flaw affecting the SETI@home client version 3.03 and potentially other iterations of the software. This issue resides within the client application's handling of network responses from distributed computing servers, creating a pathway for malicious actors to exploit the system through carefully crafted spoofed server communications. The vulnerability specifically manifests when the client processes a server response containing an excessively long string followed by a newline character, which triggers the buffer overflow condition.
The technical implementation of this vulnerability stems from inadequate input validation within the SETI@home client's network processing routines. When the client receives a response from a server, it attempts to parse and store the data in a fixed-size buffer without proper bounds checking. The buffer overflow occurs because the application fails to verify the length of incoming data before copying it into memory, allowing an attacker to exceed the allocated buffer space and overwrite adjacent memory locations. This flaw operates under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking permits memory corruption through data exceeding allocated buffer limits.
The operational impact of this vulnerability extends beyond simple denial of service to encompass full system compromise capabilities. Remote attackers can leverage this vulnerability to not only crash the SETIhome client application but also to execute arbitrary code on the victim's system with the privileges of the user running the client. This represents a significant escalation from a simple denial of service scenario to a potential remote code execution vulnerability that could enable attackers to gain persistent access to compromised systems. The distributed nature of SETIhome makes this vulnerability particularly concerning as it affects thousands of participating client systems worldwide.
The exploitation mechanism relies on the attacker's ability to control or spoof server responses that are sent to the vulnerable client applications. By crafting a server response containing an oversized string followed by a newline character, the attacker can trigger the buffer overflow condition and potentially inject malicious code into the client process memory. This attack vector aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands on compromised systems. The vulnerability demonstrates how distributed computing applications can become attack surfaces when proper input sanitization and memory management practices are not implemented.
Mitigation strategies for CVE-2003-1118 should focus on immediate patch deployment for the SETIhome client software, as well as implementing network-level controls to prevent unauthorized server communications. Organizations should ensure that all SETIhome client installations are updated to versions that include proper bounds checking and input validation mechanisms. Network administrators can implement filtering rules to detect and block suspicious server response patterns, while system administrators should monitor client behavior for signs of exploitation attempts. The vulnerability highlights the importance of defensive programming practices and proper memory management in distributed applications, emphasizing the need for comprehensive input validation and bounds checking to prevent similar issues in future software implementations.