CVE-2008-2292 in Net-SNMP
Summary
by MITRE
Buffer overflow in the __snprint_value function in snmp_get in Net-SNMP 5.1.4, 5.2.4, and 5.4.1, as used in SNMP.xs for Perl, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a large OCTETSTRING in an attribute value pair (AVP).
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability identified as CVE-2008-2292 represents a critical buffer overflow condition within the Net-SNMP implementation that affects multiple versions including 5.1.4, 5.2.4, and 5.4.1. This flaw exists specifically within the __snprint_value function located in the snmp_get component of the Net-SNMP library. The issue manifests when processing attribute value pairs containing large OCTETSTRING data types, creating a scenario where malicious input can trigger memory corruption. The vulnerability is particularly dangerous because it operates within the SNMP protocol handling layer, which is fundamental to network management and monitoring systems. The affected SNMP.xs Perl module serves as an interface for SNMP operations, making this vulnerability exploitable in environments where Perl-based SNMP applications are deployed. The buffer overflow occurs during the string formatting process when the system attempts to print or serialize the OCTETSTRING value without proper bounds checking, leading to memory corruption that can be leveraged by remote attackers.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the SNMP library's string handling routines. When an OCTETSTRING attribute value pair exceeds the allocated buffer space, the __snprint_value function fails to properly terminate or truncate the output, causing adjacent memory locations to be overwritten. This memory corruption can result in unpredictable program behavior, including application crashes that constitute a denial of service condition. The vulnerability's exploitation potential extends beyond simple DoS attacks, as the buffer overflow can potentially be chained with other techniques to achieve arbitrary code execution. The flaw operates at the boundary between user-controlled input and internal memory structures, making it particularly susceptible to exploitation through crafted SNMP packets containing oversized OCTETSTRING values. The vulnerability's impact is amplified by the widespread use of Net-SNMP in enterprise network management systems, where SNMP is commonly employed for device monitoring and configuration management.
The operational impact of CVE-2008-2292 extends significantly beyond immediate service disruption, as it represents a fundamental security weakness that can compromise entire network monitoring infrastructures. Organizations relying on Net-SNMP for critical network operations face potential exposure to unauthorized access and system compromise when this vulnerability is exploited. The denial of service aspect can disrupt network management workflows, potentially masking actual network problems or preventing administrators from accessing critical monitoring data during security incidents. In environments where SNMP is used for automated network management and alerting systems, a successful exploitation could lead to complete monitoring system failures, leaving network administrators blind to actual security threats or performance degradation. The arbitrary code execution capability presents additional risks, as attackers could potentially gain elevated privileges on systems running vulnerable SNMP implementations, especially when these systems are configured with administrative SNMP credentials or operate with elevated privileges.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent similar issues. The primary solution involves upgrading to patched versions of Net-SNMP that contain proper buffer boundary checks and input validation mechanisms. Organizations should prioritize patch management processes to ensure all SNMP-enabled systems are updated promptly. Additionally, network segmentation and access controls should be implemented to limit SNMP traffic exposure and reduce the attack surface. The implementation of SNMPv3 with proper authentication and encryption can provide additional protection layers, though this requires careful configuration to avoid introducing new vulnerabilities. Monitoring systems should be enhanced to detect anomalous SNMP traffic patterns that might indicate exploitation attempts, while also implementing intrusion detection systems that can identify potential buffer overflow exploitation attempts. This vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of how improper input validation can lead to memory corruption vulnerabilities. From an ATT&CK framework perspective, this vulnerability maps to the T1059.007 technique for execution through scripting and T1499.004 for denial of service attacks, demonstrating the multi-faceted nature of the threat it presents.