CVE-2008-7232 in xtacacsd
Summary
by MITRE
Buffer overflow in the report function in xtacacsd 4.1.2 and earlier allows remote attackers to execute arbitrary code via a crafted CONNECT TACACS command.
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Analysis
by VulDB Data Team • 11/29/2024
The vulnerability identified as CVE-2008-7232 represents a critical buffer overflow flaw within the xtacacsd daemon version 4.1.2 and earlier implementations. This issue specifically manifests within the report function of the TACACS+ authentication server software, which is widely deployed in enterprise network environments for centralized authentication management. The vulnerability arises from insufficient input validation and boundary checking when processing incoming CONNECT TACACS commands from remote clients. The buffer overflow occurs when the daemon receives a specially crafted CONNECT command that exceeds the allocated buffer space, allowing malicious actors to overwrite adjacent memory locations and potentially execute arbitrary code with the privileges of the running process.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. The flaw operates at the application layer within the TACACS+ protocol implementation, specifically targeting the authentication daemon's handling of connection requests. Attackers can exploit this vulnerability by sending a malformed CONNECT TACACS command containing excessive data that triggers the buffer overflow condition. This type of vulnerability falls under the ATT&CK technique T1203, which encompasses exploitation of vulnerabilities in software to gain unauthorized access and execute malicious code.
The operational impact of CVE-2008-7232 extends beyond simple code execution, as it represents a severe threat to network security infrastructure. Since xtacacsd is commonly used in enterprise environments for authenticating network access, successful exploitation could allow remote attackers to gain full control over the authentication server. This compromise would enable attackers to authenticate as any user within the network, potentially leading to lateral movement and access to sensitive systems. The vulnerability is particularly dangerous because it requires no authentication to exploit, making it a prime target for automated attacks. The affected systems typically operate with elevated privileges, meaning successful exploitation could result in complete system compromise and unauthorized access to critical network resources.
Mitigation strategies for CVE-2008-7232 should include immediate patching of affected xtacacsd implementations to version 4.1.3 or later, which contains the necessary buffer overflow protections. Organizations should also implement network segmentation to limit access to TACACS+ servers, utilizing firewalls to restrict connections to only authorized network segments. Additionally, monitoring systems should be configured to detect unusual CONNECT TACACS command patterns that may indicate exploitation attempts. The implementation of input validation controls and boundary checking mechanisms within the application code represents a fundamental defensive measure against similar buffer overflow vulnerabilities. Security teams should also consider deploying intrusion detection systems that can identify and alert on suspicious TACACS+ protocol traffic patterns that could indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any remaining unpatched systems within the network infrastructure.