CVE-2021-43845 : What You Need to Know
Learn about CVE-2021-43845, a high-severity vulnerability in PJSIP pjproject library. Find out the impact, affected versions, and mitigation steps to secure your systems.
CVE-2021-43845, assigned by GitHub_M, addresses an out-of-bounds read vulnerability in PJSIP's pjproject library.
Understanding CVE-2021-43845
What is CVE-2021-43845?
PJSIP is an open-source multimedia communication library. Versions up to 2.11.1 are susceptible to an out-of-bounds read issue when processing incoming RTCP XR messages containing an invalid packet size.
The Impact of CVE-2021-43845
This vulnerability may allow a malicious actor to trigger an out-of-bounds read access, potentially leading to information exposure or denial of service.
Technical Details of CVE-2021-43845
Vulnerability Description
The flaw in PJSIP's pjproject library allows an attacker to exploit a lack of input validation on incoming RTCP XR messages, leading to out-of-bounds read access.
Affected Systems and Versions
- Vendor: pjsip
- Product: pjproject
- Versions Affected: <= 2.11.1
Exploitation Mechanism
An attacker can send a crafted RTCP XR message with an improper packet size, prompting the library to improperly read data outside the intended boundaries.
Mitigation and Prevention
Immediate Steps to Take
- Apply the available patch provided by the vendor.
- Monitor vendor advisories for updates and apply security patches promptly.
Long-Term Security Practices
- Regularly update software and libraries to mitigate known vulnerabilities.
- Employ network monitoring to detect anomalous activities that may indicate exploitation attempts.
Patching and Updates
- Update to a non-vulnerable version of pjproject (post version 2.11.1) to prevent exploitation.