Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | < 60.5.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html
- http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2019/Apr/38Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/04/30/4Mailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144
- https://bugzilla.mozilla.org/show_bug.cgi?id=1507218Issue TrackingPermissions RequiredVendor Advisory
- https://github.com/RUB-NDS/Johnny-You-Are-Fired
- https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.p
- https://www.mozilla.org/security/advisories/mfsa2019-06/Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html
- http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2019/Apr/38Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/04/30/4Mailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144
- https://bugzilla.mozilla.org/show_bug.cgi?id=1507218Issue TrackingPermissions RequiredVendor Advisory
FAQ
What is CVE-2018-18509?
CVE-2018-18509 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2018-18509?
CVE-2018-18509 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-18509?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Thunderbird.