CVE-2023-29542

Description

A newline in a filename could have been used to bypass the file extension security mechanisms that replace malicious file extensions such as .lnk with .download. This could have led to accidental execution of malicious code. *This bug only affects Firefox and Thunderbird on Windows. Other versions of Firefox and Thunderbird are unaffected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.

9.8

CVSS

Severity: Critical

CVSS 3.1 •

EPSS 0.12%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Firefox ESR

Affected: Mozilla Thunderbird

References

Link	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1810793	permissions required
https://bugzilla.mozilla.org/show_bug.cgi?id=1815062	permissions required
https://www.mozilla.org/security/advisories/mfsa2023-13/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2023-14/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2023-15/	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-29542?: CVE-2023-29542 has been scored as a critical severity vulnerability.
How to fix CVE-2023-29542?: To fix CVE-2023-29542, 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-2023-29542 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-29542 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-29542?: CVE-2023-29542 affects Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird.

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