Vulnerability identifier: #VU5839
Vulnerability risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
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 cause denial of service.
The vulnerability exists due to improper input validation during a renegotiation handshake, if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake. A remote attacker can send a specially crafted data to vulnerable application and case denial of service conditions.
Successful exploitation of the vulnerability may result in denial of service (DoS) attack.
Mitigation
Update to version 1.1.0e.
Vulnerable software versions
OpenSSL: 1.1.0 - 1.1.0d
External links
http://www.openssl.org/news/secadv/20170216.txt
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.