Improper Certificate Validation - CVE-2020-24661
Published: August 26, 2020 / Updated: September 15, 2020
Vulnerability identifier: #VU46730
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-24661
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
GNOME Geary before 3.36.3 mishandles pinned TLS certificate verification for IMAP and SMTP services using invalid TLS certificates (e.g., self-signed certificates) when the client system is not configured to use a system-provided PKCS#11 store. This allows a meddler in the middle to present a different invalid certificate to intercept incoming and outgoing mail.
Affected software
libproxy (Alpine package)
geary (Alpine package)
geary
Fedora
geary (Alpine package)
geary
Fedora
How to mitigate CVE-2020-24661
Install update from vendor's website.
libproxy (Alpine package) - update to 0.4.15-r8
geary - addressed in versions master-3220200827090119.1, 3.34.2-2.fc31, 3.36.3.1-1.fc32
geary - addressed in versions master-3220200827090119.1, 3.34.2-2.fc31, 3.36.3.1-1.fc32
External References
- https://gitlab.gnome.org/GNOME/geary/-/issues/866
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G7OTYTGND6EFOKNQJWCHKKXKSN7SM73Y/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NS6CSTOBVO5HSAR3X5CT6DS6QDHXDB26/