Race condition in OpenSSL - CVE-2015-3216
Published: October 25, 2023
Vulnerability identifier: #VU82377
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2015-3216
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSL Software Foundation
Affected software:
OpenSSL
OpenSSL
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service attack.
The vulnerability exists due to a race condition in a certain Red Hat patch to the PRNG lock implementation in the ssleay_rand_bytes function in OpenSSL. A local user can exploit the race and cause a denial of service (application crash) by establishing many TLS sessions to a multithreaded server, leading to use of a negative value for a certain length field.
How to mitigate CVE-2015-3216
Install updates from vendor's website.
Sources
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00024.html
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00026.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00006.html
- http://rhn.redhat.com/errata/RHSA-2015-1115.html
- http://rhn.redhat.com/errata/RHSA-2016-2957.html
- http://www.securityfocus.com/bid/75219
- http://www.securitytracker.com/id/1032587
- https://bugzilla.redhat.com/show_bug.cgi?id=1225994