CVE-2020-29074 : Exploit Details and Defense Strategies

x11vnc 0.9.16 in scan.c uses insecure permissions in shmget calls, potentially allowing unauthorized access.

Understanding CVE-2020-29074

This CVE involves a vulnerability in x11vnc 0.9.16 that could be exploited by unauthorized actors.

What is CVE-2020-29074?

The vulnerability in scan.c of x11vnc 0.9.16 arises from the use of insecure permissions in shmget calls, enabling access by entities other than the current user.

The Impact of CVE-2020-29074

The vulnerability could lead to unauthorized access to sensitive information or system compromise by malicious actors.

Technical Details of CVE-2020-29074

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The issue stems from x11vnc 0.9.16's utilization of IPC_CREAT|0777 in shmget calls, which can be exploited by unauthorized users.

Affected Systems and Versions

Product: x11vnc
Vendor: n/a
Version: 0.9.16

Exploitation Mechanism

Unauthorized actors can exploit the vulnerability by leveraging the insecure permissions in the shmget calls.

Mitigation and Prevention

Protecting systems from CVE-2020-29074 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update x11vnc to a patched version or apply vendor-supplied fixes.
Restrict access to vulnerable systems.
Monitor for any unauthorized access attempts.

Long-Term Security Practices

Regularly update software and apply security patches.
Implement the principle of least privilege to limit access rights.
Conduct security audits and assessments periodically.

Patching and Updates

Ensure timely installation of patches and updates provided by the vendor to address the vulnerability.