Race condition in Mozilla Thunderbird - CVE-2021-29948

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Main Vulnerability Database Vulnerabilities #VU52347

Race condition in Mozilla Thunderbird - CVE-2021-29948

Published: April 19, 2021


Vulnerability identifier: #VU52347
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-29948
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition where signatures are written to disk before and read during verification. A local user can exploit the race and replace files in the process.


Affected software

Mozilla Thunderbird
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for Power, little endian
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Workstation Extension
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird (Red Hat package)
thunderbird
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other

How to mitigate CVE-2021-29948

Install updates from vendor's website.

Mozilla Thunderbird - update to 78.10.0
thunderbird (Red Hat package) - addressed in versions 78.10.0-1.el7_9, 78.10.0-1.el8_1, 78.10.0-1.el8_2, 78.10.0-1.el8_3
thunderbird - update to 78.10.0-1.0.1
MozillaThunderbird - update to 78.10.0-8.23.1
MozillaThunderbird-debuginfo - update to 78.10.0-8.23.1
MozillaThunderbird-debugsource - update to 78.10.0-8.23.1
MozillaThunderbird-translations-common - update to 78.10.0-8.23.1
MozillaThunderbird-translations-other - update to 78.10.0-8.23.1

External References

Related Security Bulletins