Improper Certificate Validation in Fedora - CVE-2015-3420
Published: September 19, 2017 / Updated: August 8, 2020
Vulnerability identifier: #VU38233
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-3420
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 perform a denial of service (DoS) attack.
The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote attackers to cause a denial of service (login process crash) via vectors related to handshake failures.
Affected software
Fedora
dovecot
dovecot
How to mitigate CVE-2015-3420
Install update from vendor's website.
dovecot - addressed in versions 2.2.16-2.fc21, 2.2.16-2.fc22
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157030.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158236.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html
- http://www.openwall.com/lists/oss-security/2015/04/27/1
- http://www.openwall.com/lists/oss-security/2015/04/28/4
- http://www.securityfocus.com/bid/74335
- https://bugzilla.redhat.com/show_bug.cgi?id=1216057
- https://dovecot.org/pipermail/dovecot/2015-April/100618.html
- https://dovecot.org/pipermail/dovecot-news/2015-May/000292.html