CVE-2006-4029 in AGEphone
Summary
by MITRE
Stack-based buffer overflow in sipd.dll in AGEphone 1.24 and 1.38.1 allows remote attackers to execute arbitrary code via a crafted UDP SIP packet.
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Analysis
by VulDB Data Team • 08/01/2018
The vulnerability identified as CVE-2006-4029 represents a critical stack-based buffer overflow flaw within the sipd.dll component of AGEphone versions 1.24 and 1.38.1. This issue specifically affects the Session Initiation Protocol implementation within the telephony software, creating a remote code execution vector that adversaries can exploit through carefully crafted UDP SIP packets. The vulnerability stems from inadequate input validation mechanisms within the SIP processing module, where user-supplied data is directly copied to a fixed-size stack buffer without proper bounds checking. This fundamental flaw in memory management creates an exploitable condition where attacker-controlled data can overwrite adjacent stack memory, potentially allowing for arbitrary code execution with the privileges of the affected application.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent memory locations. The flaw manifests when the sipd.dll module processes incoming UDP SIP packets that contain malformed or oversized data fields, particularly in SIP headers or body content. The stack buffer overflow occurs because the application does not validate the length of incoming SIP message components before copying them into local stack buffers, creating a predictable memory corruption scenario. Attackers can construct specific SIP packets that trigger the overflow by exceeding the allocated buffer space, potentially overwriting return addresses, saved registers, and other critical stack data structures that control program execution flow.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass significant security implications for organizations relying on AGEphone for voice communication services. Network-based attackers can leverage this vulnerability to gain unauthorized access to systems running affected AGEphone versions without requiring any authentication credentials or local access. The remote exploitation capability means that attackers can target these systems from anywhere on the internet, making the vulnerability particularly dangerous in environments where SIP traffic traverses public networks. The attack surface is further expanded by the fact that SIP protocols are commonly used in enterprise communications, making organizations vulnerable to persistent attacks that could lead to complete system compromise, data exfiltration, or establishment of persistent backdoors within network infrastructure.
Organizations should implement immediate mitigations including patching to the latest available versions of AGEphone that address the buffer overflow vulnerability, as well as network-level protections such as SIP filtering rules that restrict incoming UDP traffic to legitimate SIP endpoints. Network administrators should deploy intrusion prevention systems capable of detecting and blocking malformed SIP packets that match the exploit patterns associated with this vulnerability. The implementation of proper input validation and bounds checking in SIP processing components aligns with ATT&CK technique T1203, which covers legitimate program execution through command and control channels, and represents a critical defensive measure against remote code execution attacks. Additionally, organizations should consider network segmentation to isolate SIP traffic and implement monitoring solutions that can detect anomalous SIP packet patterns, providing early warning capabilities for potential exploitation attempts.