SB2017091918 - Improper Certificate Validation in Fedoraproject Fedora
Published: September 19, 2017 Updated: August 8, 2020
Security Bulletin ID
SB2017091918
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Certificate Validation (CVE-ID: CVE-2015-3420)
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.
Remediation
Install update from vendor's website.
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