CVE-2018-25356 in SIPp
Summary
by MITRE • 05/23/2026
SIPp 3.6 and earlier contains a local buffer overflow vulnerability in command-line argument handling that allows local attackers to crash the application or execute arbitrary code. Attackers can trigger the vulnerability by supplying oversized input to the -3pcc, -i, or -log_file parameters, causing strcpy to write beyond buffer boundaries in sipp.cpp.
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Analysis
by VulDB Data Team • 05/24/2026
The vulnerability under discussion affects SIPp version 3.6 and earlier, representing a critical local buffer overflow flaw in the command-line argument processing mechanism. This issue stems from improper input validation within the sipp.cpp source file where the application employs the unsafe strcpy function to handle user-supplied parameters. The vulnerability specifically impacts three command-line options: -3pcc, -i, and -log_file, which are commonly used for configuring SIPp's behavior during VoIP testing scenarios. When attackers provide excessively long input strings to these parameters, the application fails to enforce proper buffer size limits, leading to memory corruption that can be exploited for malicious purposes.
The technical implementation of this vulnerability demonstrates a classic buffer overflow condition where the strcpy function does not perform bounds checking before copying user input into fixed-size buffers. This flaw falls under the CWE-121 category of stack-based buffer overflow, though it could also be classified as CWE-787 for out-of-bounds write conditions. The attack surface is limited to local users since the vulnerability requires direct access to the system where SIPp is running, making it a local privilege escalation vector rather than a remote exploit. The exploitation process involves crafting specially formatted command-line arguments that exceed the allocated buffer space, causing the program to overwrite adjacent memory locations and potentially leading to application crashes or code execution.
From an operational perspective, this vulnerability poses significant risks to organizations that rely on SIPp for network testing and quality assurance activities. The local nature of the attack means that any user with access to the system where SIPp is installed can potentially exploit this flaw, making it particularly dangerous in multi-user environments or when SIPp is run with elevated privileges. The impact extends beyond simple application instability, as successful exploitation could allow attackers to execute arbitrary code with the privileges of the SIPp process, potentially leading to complete system compromise. In enterprise VoIP testing environments, this vulnerability could be leveraged to gain unauthorized access to testing infrastructure, potentially exposing sensitive network configurations or enabling further attacks against the broader network.
Organizations should immediately implement mitigations including upgrading to SIPp version 3.7 or later, which contains patches addressing this buffer overflow vulnerability. System administrators should also consider implementing least privilege principles for SIPp execution, ensuring that the application runs with minimal required permissions. Additionally, input validation should be enforced at the application level by replacing unsafe string functions with their safer counterparts such as strncpy or strlcpy, and implementing proper bounds checking for all command-line parameter handling. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation may involve crafting malicious command-line arguments to achieve code execution. Network monitoring should be enhanced to detect unusual command-line argument patterns that might indicate exploitation attempts, and regular security assessments should be conducted to identify similar vulnerabilities in other network testing tools and utilities.