CVE-2019-7251 Explained : Impact and Mitigation
Learn about CVE-2019-7251, an Integer Signedness issue in Digium Asterisk versions 15.7.1 and earlier, allowing remote authenticated users to crash the system via a specially crafted SDP protocol violation. Find mitigation steps and prevention measures.
A problem related to the signedness of an integer in the res_pjsip_sdp_rtp module of Digium Asterisk versions 15.7.1 and earlier, as well as 16.1.1 and earlier, allows remote authenticated users to cause a crash in Asterisk by exploiting a specifically crafted SDP protocol violation.
Understanding CVE-2019-7251
This CVE identifies an Integer Signedness issue in the Digium Asterisk software, potentially leading to a crash when manipulated by authenticated remote users.
What is CVE-2019-7251?
CVE-2019-7251 is a vulnerability in Digium Asterisk versions 15.7.1 and earlier, as well as 16.1.1 and earlier, that enables remote authenticated users to crash the system through a specially crafted SDP protocol violation.
The Impact of CVE-2019-7251
The vulnerability allows attackers to exploit the signedness issue of an integer, leading to a crash in the Asterisk system, impacting its availability and potentially causing service disruptions.
Technical Details of CVE-2019-7251
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The issue lies in the res_pjsip_sdp_rtp module of Digium Asterisk versions 15.7.1 and earlier, as well as 16.1.1 and earlier, where the signedness of an integer is not properly handled, allowing for a crash when manipulated.
Affected Systems and Versions
- Digium Asterisk versions 15.7.1 and earlier
- Digium Asterisk versions 16.1.1 and earlier
Exploitation Mechanism
- Remote authenticated users can exploit a specially crafted SDP protocol violation to trigger the vulnerability and cause a crash in the Asterisk system.
Mitigation and Prevention
Protecting systems from CVE-2019-7251 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches or updates provided by Digium to address the vulnerability.
- Monitor network traffic for any signs of exploitation.
Long-Term Security Practices
- Regularly update and patch software to prevent known vulnerabilities.
- Implement strong authentication mechanisms to prevent unauthorized access.
Patching and Updates
- Digium has released patches for affected versions to mitigate the CVE-2019-7251 vulnerability.