Medium severity · published Oct 20, 2021
CVE-2021-42762
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…
5.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
FE
Fedora · Fedoraproject
33; 34; 35 · source: NVD
WE
Webkitgtk · Webkitgtk
before 2.34.1 · source: NVD
WW
Wpe Webkit · Wpewebkit
before 2.34.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-42762
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-42762
Mailing List
http://www.openwall.com/lists/oss-security/2021/10/26/9
Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/1
Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/2
Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/4
Exploit
https://bugs.webkit.org/show_bug.cgi?id=231479
Third Party Advisory
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
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