Division by zero in LibVNC LibVNCServer



| Updated: 2020-11-29
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-25708
CWE-ID CWE-369
Exploitation vector Network
Public exploit N/A
Vulnerable software
 LibVNCServer
Server applications / Remote management servers, RDP, SSH

Vendor LibVNC

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Division by zero

EUVDB-ID: #VU48699

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-25708

CWE-ID: CWE-369 - Divide By Zero

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to divide by zero error when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service. A remote attacker can pass specially crafted file to the application and crash it.

Mitigation

Install update from vendor's website.

Vulnerable software versions

LibVNCServer: 0.9.0 - 0.9.12

CPE2.3 External links

https://bugzilla.redhat.com/show_bug.cgi?id=1896739
https://github.com/LibVNC/libvncserver/issues/409
https://github.com/LibVNC/libvncserver/commit/673c07a75ed844d74676f3ccdcfdc706a7052dba


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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