#VU77554 Input validation error in OpenSSL - CVE-2015-1794
Vulnerability identifier: #VU77554
Vulnerability risk: Low
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:Clear]
CVE-ID: CVE-2015-1794
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
OpenSSL
Server applications /
Encryption software
Vendor: OpenSSL Software Foundation
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in the ssl3_get_key_exchange() function in ssl/s3_clnt.c in OpenSSL. A remote attacker can pass specially crafted zero p value in an anonymous Diffie-Hellman (DH) ServerKeyExchange message to the application and perform a denial of service (DoS) attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenSSL: 1.0.2d - 1.0.2
External links
https://openssl.org/news/secadv/20151203.txt
https://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
https://lists.opensuse.org/opensuse-security-announce/2016-03/msg00009.html
https://fortiguard.com/advisory/openssl-advisory-december-2015
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl
https://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583
https://www.ubuntu.com/usn/USN-2830-1
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://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=ada57746b6b80beae73111fe1291bf8dd89af91c
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.
