Division by zero in LibVNC LibVNCServer
| 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 Subscribe |
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
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-25708
CWE-ID:
CWE-369 - Divide By Zero
Exploit availability: No
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsLibVNCServer: 0.9.0 - 0.9.12
External linkshttp://bugzilla.redhat.com/show_bug.cgi?id=1896739
http://github.com/LibVNC/libvncserver/issues/409
http://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.
