CVE-2001-1096 in AIX
Summary
by MITRE
Buffer overflows in muxatmd in AIX 4 allows an attacker to cause a core dump and possibly execute code.
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Analysis
by VulDB Data Team • 06/27/2021
The vulnerability identified as CVE-2001-1096 represents a critical buffer overflow flaw within the muxatmd component of AIX 4 operating systems. This issue resides in the multiplexer application that handles atm (asynchronous transfer mode) network connections, making it particularly dangerous in environments where ATM networking is utilized. The vulnerability stems from insufficient input validation and improper buffer management within the muxatmd daemon, which processes network traffic for ATM connections. The flaw manifests when the application receives malformed input data that exceeds the allocated buffer space, leading to memory corruption that can be exploited by malicious actors. This particular vulnerability affects IBM AIX 4 systems and demonstrates the classic buffer overflow pattern that has plagued Unix-based systems for decades.
The technical exploitation of this buffer overflow vulnerability occurs through careful manipulation of input parameters sent to the muxatmd service. When the application processes malformed data, it writes beyond the boundaries of allocated memory buffers, potentially overwriting adjacent memory locations including return addresses and control data. This memory corruption can result in the application crashing with a core dump, but more critically, skilled attackers can craft specific input sequences that redirect program execution flow to execute arbitrary code within the context of the vulnerable service. The attacker-controlled execution path typically involves overwriting the instruction pointer or return addresses on the stack, effectively allowing code execution with the privileges of the muxatmd process. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a fundamental flaw in memory management practices that violates secure coding principles.
The operational impact of CVE-2001-1096 extends beyond simple denial of service scenarios to encompass potential system compromise and unauthorized access. Organizations running AIX 4 systems with active ATM networking capabilities face significant risk from this vulnerability, as the muxatmd service typically operates with elevated privileges necessary for network management functions. Successful exploitation could allow attackers to gain unauthorized access to network infrastructure, potentially enabling them to intercept or manipulate ATM traffic, escalate privileges within the system, or use the compromised service as a launching point for further attacks. The vulnerability's exploitation potential aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, as attackers might leverage the executed code to establish persistent access or deploy additional malicious payloads. System administrators must consider that this vulnerability could be exploited as part of a broader attack chain targeting network infrastructure components.
Mitigation strategies for CVE-2001-1096 should prioritize immediate system hardening and patch management approaches. The most effective solution involves applying the appropriate IBM AIX patches and updates that address the buffer overflow conditions within muxatmd. Organizations should disable or remove the muxatmd service entirely if ATM networking is not required, as this eliminates the attack surface entirely. Network segmentation and access controls should be implemented to limit exposure of systems running vulnerable versions of AIX 4, particularly those with active ATM connections. Additionally, implementing intrusion detection systems and monitoring for unusual network traffic patterns related to ATM services can help detect exploitation attempts. System administrators should also consider implementing address space layout randomization and stack canary protections where available, though these mitigations are more effective against modern exploitation techniques than against the specific vulnerability described in CVE-2001-1096. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions that may exist in other system components or third-party applications.