CVE-2019-20840 : What You Need to Know
Discover the impact of CVE-2019-20840, a vulnerability in LibVNCServer before version 0.9.13 causing crashes due to unaligned accesses. Learn about affected systems, exploitation, and mitigation steps.
A problem has been found in LibVNCServer, version 0.9.13 and earlier, leading to a crash due to unaligned accesses in the function hybiReadAndDecode.
Understanding CVE-2019-20840
What is CVE-2019-20840?
An issue in LibVNCServer before version 0.9.13 can result in a crash due to unaligned accesses in hybiReadAndDecode.
The Impact of CVE-2019-20840
This vulnerability can potentially lead to a crash in systems using affected versions of LibVNCServer.
Technical Details of CVE-2019-20840
Vulnerability Description
The issue lies in libvncserver/ws_decode.c, where unaligned accesses in hybiReadAndDecode can trigger a crash.
Affected Systems and Versions
- Product: n/a
- Vendor: n/a
- Versions affected: 0.9.13 and earlier
Exploitation Mechanism
The vulnerability can be exploited by triggering unaligned accesses in the hybiReadAndDecode function.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches provided by the vendor
- Monitor vendor advisories for updates
Long-Term Security Practices
- Regularly update software and libraries
- Conduct security assessments and audits
Patching and Updates
Ensure to apply the latest patches and updates released by LibVNCServer to address this vulnerability.