Improper Certificate Validation Affecting thunderbird package, versions <1:91.10.0-1~deb10u1


0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Confidentiality High

    Threat Intelligence

    EPSS 0.1% (40th percentile)
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NVD
6.5 medium
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Red Hat
7.5 high
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SUSE
7.5 high

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  • Snyk ID SNYK-DEBIAN10-THUNDERBIRD-2849957
  • published 1 Jun 2022
  • disclosed 22 Dec 2022

How to fix?

Upgrade Debian:10 thunderbird to version 1:91.10.0-1~deb10u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Debian. See How to fix? for Debian:10 relevant fixed versions and status.

When displaying the sender of an email, and the sender name contained the Braille Pattern Blank space character multiple times, Thunderbird would have displayed all the spaces. This could have been used by an attacker to send an email message with the attacker's digital signature, that was shown with an arbitrary sender email address chosen by the attacker. If the sender name started with a false email address, followed by many Braille space characters, the attacker's email address was not visible. Because Thunderbird compared the invisible sender address with the signature's email address, if the signing key or certificate was accepted by Thunderbird, the email was shown as having a valid digital signature. This vulnerability affects Thunderbird < 91.10.