CVE-2019-11755
First published: Wed Sep 25 2019(Updated: )
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.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Thunderbird | <68.1.1 | |
| Mozilla Thunderbird | <68.1.1 | 68.1.1 |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:128.7.0esr-1~deb11u1 1:128.5.0esr-1~deb12u1 1:128.7.0esr-1~deb12u1 1:128.6.0esr-1 1:128.7.0esr-1 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1240290
- https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html
- https://seclists.org/bugtraq/2019/Nov/24
- https://usn.ubuntu.com/4202-1/
- https://usn.ubuntu.com/4335-1/
- https://www.debian.org/security/2019/dsa-4571
- https://www.mozilla.org/security/advisories/mfsa2019-32/
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-32/
- https://launchpad.net/bugs/cve/CVE-2019-11755
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-32/#CVE-2019-11755
- https://security-tracker.debian.org/tracker/CVE-2019-11755
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11755
- https://nvd.nist.gov/vuln/detail/CVE-2019-11755
- https://ubuntu.com/security/CVE-2019-11755
Frequently Asked Questions
What is CVE-2019-11755?
CVE-2019-11755 is a vulnerability in S/MIME where a crafted message with an encryption layer and a SignedData layer may show a valid digital signature despite the signer not having access to the encrypted message.
Which software is affected by CVE-2019-11755?
Mozilla Thunderbird versions up to 68.1.1 and some versions of Thunderbird in Debian and Ubuntu are affected.
What is the severity of CVE-2019-11755?
The severity of CVE-2019-11755 is high with a CVSS score of 7.5.
How can I fix CVE-2019-11755?
Update Mozilla Thunderbird to version 68.2.1 or later, or follow the recommended package updates for Debian and Ubuntu.
Where can I find more information about CVE-2019-11755?
You can find more information about CVE-2019-11755 in the references provided: [Mozilla Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1240290), [Mozilla Security Advisories](https://www.mozilla.org/en-US/security/advisories/mfsa2019-32/), [CVE Mitre](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11755).
- collector/nvd-index
- collector/mozilla-advisory
- vendor/mozilla
- vendor/thunderbird
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- source/Mozilla
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/description
- agent/event
- collector/nvd-cve
- source/NVD
- agent/last-modified-date
- agent/trending
- agent/source
- agent/tags
- agent/author
- agent/softwarecombine
- collector/security-tracker-debian
- source/Debian
- canonical/mozilla thunderbird
- package-manager/debian