CVE-2021-42762 Security feature bypass in n/a

Medium 5.3 Published 20 Oct 2021 Updated 4 Aug 2024

A sandbox bypass in WebKitGTK allows a confined process to deceive host services about its sandbox status via VFS syscall abuse.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-42762?

CVE-2021-42762 is a medium-severity vulnerability in Debian Debian Linux, published on 20 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133.

Which versions are affected by CVE-2021-42762?

It affects 4 products.

Linux distribution packages (20)

`webkit2gtk3` SUSE:HPE Helion OpenStack 8	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`2.32.4-15.1`
`webkit2gtk3` SUSE:Linux Enterprise Module for Basesystem 15 SP3	All versions	`2.32.4-15.1`
`webkit2gtk3` SUSE:Linux Enterprise Module for Desktop Applications 15 SP2	All versions	`2.32.4-15.1`
`webkit2gtk3` SUSE:Linux Enterprise Module for Desktop Applications 15 SP3	All versions	`2.32.4-15.1`
`webkit2gtk3` SUSE:Linux Enterprise Server 12 SP2-BCL	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server 12 SP3-BCL	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server 12 SP3-LTSS	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server 12 SP4-LTSS	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server 12 SP5	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server for SAP Applications 12 SP3	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server for SAP Applications 12 SP4	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:OpenStack Cloud 8	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:OpenStack Cloud 9	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:OpenStack Cloud Crowbar 8	All versions	`2.32.4-2.74.5`
`webkit2gtk3` SUSE:OpenStack Cloud Crowbar 9	All versions	`2.32.4-2.74.5`
`webkit2gtk3` openSUSE:Leap 15.2	All versions	`2.32.4-lp152.2.22.1`
`webkit2gtk3` openSUSE:Leap 15.3	All versions	`2.32.4-15.1`

Products include Debian Debian Linux, Fedoraproject Fedora, Webkitgtk Webkitgtk, Wpewebkit Wpe Webkit.

How do I fix CVE-2021-42762?

Upgrade to a fixed version.

Is CVE-2021-42762 being exploited?

There is no known exploitation of CVE-2021-42762 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2021-42762, GHSA-4ch5-gr7v-q6wq, SUSE-SU-2021:3603-1, SUSE-SU-2021:3768-1, UBUNTU-CVE-2021-42762, openSUSE-SU-2021:1454-1 and 1 more.