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. This vulnerability affects Thunderbird < 68.1.1.
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
| Link | Tags |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1240290 | vendor advisory issue tracking permissions required |
| https://www.mozilla.org/security/advisories/mfsa2019-32/ | vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html | vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html | vendor advisory |
| https://seclists.org/bugtraq/2019/Nov/24 | mailing list |
| https://www.debian.org/security/2019/dsa-4571 | vendor advisory |
| https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html | mailing list |
| https://usn.ubuntu.com/4202-1/ | vendor advisory |
| https://usn.ubuntu.com/4335-1/ | vendor advisory |