Vulnerability in Mozilla Thunderbird
CVE-2018-18509
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.017 (76.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html (vendor-advisory)
- www.mozilla.org/security/advisories/mfsa2019-06/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
- www.openwall.com/lists/oss-security/2019/04/30/4 (mailing-list, Mailing List, Third Party Advisory)
- seclists.org/fulldisclosure/2019/Apr/38 (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html (VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:1144 (vendor-advisory)
- github.com/RUB-NDS/Johnny-You-Are-Fired
- github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf
Frequently asked questions
- What is CVE-2018-18509?
- CVE-2018-18509 is a medium-severity vulnerability in Mozilla Thunderbird, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2019-04-26.
- How severe is CVE-2018-18509?
- Medium severity. CVSS v3 base score is 5.3 out of 10.