#VU77556 Race condition in OpenSSL - CVE-2015-3196
Vulnerability identifier: #VU77556
Vulnerability risk: Medium
CVSSv4.0: 2.7 [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:
CWE-ID:
CWE-362
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
OpenSSL
Server applications /
Encryption software
Vendor: OpenSSL Software Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in the ssl/s3_clnt.c in OpenSSL when used for a multi-threaded client. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system via a crafted ServerKeyExchange message.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenSSL: 1.0.0s - 1.0.0p, 1.0.1h - 1.0.1, 1.0.2c - 1.0.2
External links
https://openssl.org/news/secadv/20151203.txt
https://git.openssl.org/?p=openssl.git;a=commit;h=3c66a669dfc7b3792f7af0758ea26fe8502ce70c
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100
https://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
https://marc.info/?l=bugtraq&m=145382583417444&w=2
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04944173
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
https://www.securityfocus.com/bid/78622
https://fortiguard.com/advisory/openssl-advisory-december-2015
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl
https://rhn.redhat.com/errata/RHSA-2015-2617.html
https://www.fortiguard.com/advisory/openssl-advisory-december-2015
https://www.ubuntu.com/usn/USN-2830-1
https://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583
https://lists.fedoraproject.org/pipermail/package-announce/2015-December/173801.html
https://www.debian.org/security/2015/dsa-3413
https://lists.opensuse.org/opensuse-updates/2015-12/msg00070.html
https://lists.opensuse.org/opensuse-updates/2015-12/msg00071.html
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322
https://www.securitytracker.com/id/1034294
https://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
https://rhn.redhat.com/errata/RHSA-2016-2957.html
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
