Security restrictions bypass in x11vnc



Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2020-29074
CWE-ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
 x11vnc
Other software / Other software solutions

Vendor www.karlrunge.com

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU48700

Risk: Medium

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-29074

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to x11vnc creates shared memory segments with 0777 mode in scan.c. A local user run a specially crafted program to gain access to sensitive information, trigger denial of service or interfere with the VNC session of another user on the host.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

x11vnc: 0.9.13 - 0.9.16

CPE2.3 External links

https://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a
https://www.debian.org/security/2020/dsa-4799


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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