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.
EPSS: 0.017 (74.5th percentile) — read the EPSS interpretation.
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.
Affected products
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- security@mozilla.org (vendor-advisory, x_refsource_SUSE)
- security@mozilla.org (x_refsource_MISC, Vendor Advisory)
- security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking, Vendor Advisory)
- security@mozilla.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@mozilla.org (mailing-list, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
- security@mozilla.org (VDB Entry, Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (x_refsource_REDHAT, vendor-advisory)
- security@mozilla.org (x_refsource_MISC)
- security@mozilla.org (x_refsource_MISC)
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.