S/MIME Signature Verification Flaw in Thunderbird < 60.5.1 Allows Content Manipulation

S/MIME Signature Verification Flaw in Thunderbird < 60.5.1 Allows Content Manipulation

CVE-2018-18509 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

Learn more about our Web Application Penetration Testing UK.