CVE-2020-25708: Divide by Zero
First published: Wed Nov 11 2020(Updated: )
A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libvncserver Project Libvncserver | =0.9.12 | |
| Redhat Enterprise Linux | =6.0 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =10.0 | |
| redhat/libvncserver | <0.9.13 | 0.9.13 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1896739
- https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html
- https://github.com/LibVNC/libvncserver/issues/409
- https://github.com/LibVNC/libvncserver/commit/673c07a75ed844d74676f3ccdcfdc706a7052dba
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1896740
- https://github.com/TurboVNC/turbovnc/pull/273#issuecomment-784498698
- https://access.redhat.com/security/cve/cve-2020-25708
- https://access.redhat.com/errata/RHSA-2021:1811
Frequently Asked Questions
What is CVE-2020-25708?
CVE-2020-25708 is a divide by zero vulnerability in libvncserver-0.9.12.
What is the severity of CVE-2020-25708?
CVE-2020-25708 has a severity value of 7.5 (high).
How does CVE-2020-25708 impact the VNC server?
CVE-2020-25708 allows a malicious client to send a specially crafted message that triggers a divide by zero, leading to a floating point exception and denial of service.
How can I mitigate CVE-2020-25708?
To mitigate CVE-2020-25708, update libvncserver to version 0.9.13.
Where can I find more information about CVE-2020-25708?
You can find more information about CVE-2020-25708 in the references section: [Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=1896739), [Debian LTS Announce](https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html), [GitHub Issue](https://github.com/LibVNC/libvncserver/issues/409).
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