CVE-2021-42762

Public Exploit

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.

5.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.01%

Vendor Advisory debian.org Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory webkit.org

Affected: n/a n/a

References

Link	Tags
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q	third party advisory
https://bugs.webkit.org/show_bug.cgi?id=231479	issue tracking exploit vendor advisory
http://www.openwall.com/lists/oss-security/2021/10/26/9	third party advisory mailing list
http://www.openwall.com/lists/oss-security/2021/10/27/1	third party advisory mailing list
http://www.openwall.com/lists/oss-security/2021/10/27/2	third party advisory mailing list
http://www.openwall.com/lists/oss-security/2021/10/27/4	third party advisory mailing list
https://www.debian.org/security/2021/dsa-4995	third party advisory vendor advisory
https://www.debian.org/security/2021/dsa-4996	third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5J2LZQTDX53DNSKSGU7TQYCO2HKSTY4/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ON5SDVVPVPCAGFPW2GHYATZVZYLPW2L4/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H6MGXCX7P5AHWOQ6IRT477UKT7IS4DAD/	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-42762?: CVE-2021-42762 has been scored as a medium severity vulnerability.
How to fix CVE-2021-42762?: To fix CVE-2021-42762, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-42762 being actively exploited in the wild?: It is possible that CVE-2021-42762 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.