Mozilla Foundation Security Advisory 2019-32

#CVE-2019-11755: Spoofing a message author via a crafted S/MIME message

Reporter

Falko Strenzke

Impact

moderate

Description

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer.

References

• Bug 1240290