CVE-2020-29260 Denial of service in n/a

High 7.5 Published 2 Sep 2022 Updated 4 Aug 2024

A memory leak in libvncclient allows attackers to cause a denial of service by exhausting system memory.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-29260?

CVE-2020-29260 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 2 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().

Weakness: CWE-400

Which versions are affected by CVE-2020-29260?

It affects 2 products.

Linux distribution packages (11)

`LibVNCServer` SUSE:Linux Enterprise Module for Package Hub 15 SP3	All versions	`0.9.10-150000.4.29.1`
`LibVNCServer` SUSE:Linux Enterprise Module for Package Hub 15 SP4	All versions	`0.9.10-150000.4.29.1`
`LibVNCServer` SUSE:Linux Enterprise Module for Package Hub 15 SP4	All versions	`0.9.13-150400.3.3.1`
`LibVNCServer` SUSE:Linux Enterprise Server 12 SP5	All versions	`0.9.9-17.41.1`
`LibVNCServer` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`0.9.9-17.41.1`
`LibVNCServer` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`0.9.9-17.41.1`
`LibVNCServer` SUSE:Linux Enterprise Workstation Extension 15 SP3	All versions	`0.9.10-150000.4.29.1`
`LibVNCServer` SUSE:Linux Enterprise Workstation Extension 15 SP4	All versions	`0.9.13-150400.3.3.1`
`LibVNCServer` openSUSE:Leap 15.3	All versions	`0.9.10-150000.4.29.1`
`LibVNCServer` openSUSE:Leap 15.4	All versions	`0.9.10-150000.4.29.1`
`LibVNCServer` openSUSE:Leap 15.4	All versions	`0.9.13-150400.3.3.1`

Products include Debian Debian Linux, Libvncserver Project Libvncserver.

How do I fix CVE-2020-29260?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-29260 being exploited?

There is no known exploitation of CVE-2020-29260 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2020-29260, GHSA-mgvc-cjfr-fjf4, MGASA-2022-0363, OESA-2022-2090, SUSE-SU-2022:3540-1, SUSE-SU-2022:3990-1 and 3 more.