CVE-2021-43303 : Security Advisory and Response
Learn about CVE-2021-43303, a buffer overflow vulnerability in PJSUA API. Understand the impact, affected versions, and steps to mitigate this security issue.
A buffer overflow vulnerability in the PJSUA API that could allow an attacker to trigger a buffer overflow.
Understanding CVE-2021-43303
What is CVE-2021-43303?
The CVE-2021-43303 vulnerability involves a buffer overflow in the PJSUA API, specifically when calling pjsua_call_dump. An attacker-controlled input could lead to a buffer overflow, potentially causing a security breach.
The Impact of CVE-2021-43303
The buffer overflow issue could allow an attacker to execute arbitrary code, crash the application, or potentially gain unauthorized access to the system.
Technical Details of CVE-2021-43303
Vulnerability Description
A buffer overflow occurs in the PJSUA API when calling pjsua_call_dump due to an insufficiently sized output buffer, leading to a potential overflow.
Affected Systems and Versions
- Vendor: teluu
- Product: pjsip
- Versions Affected: up to 2.11.1
Exploitation Mechanism
The vulnerability can be exploited by supplying a buffer smaller than 128 characters, causing an overflow regardless of the 'maxlen' argument provided.
Mitigation and Prevention
Immediate Steps to Take
- Update the pjsip software to the latest version that includes a patch for CVE-2021-43303.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly monitor for security advisories and updates from teluu.
- Conduct security training for developers to prevent similar coding vulnerabilities.
Patching and Updates
Apply patches provided by the vendor to mitigate the CVE-2021-43303 vulnerability.