#VU13325 Improper input validation


Published: 2018-06-12 | Updated: 2018-08-14

Vulnerability identifier: #VU13325

Vulnerability risk: Low

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: CVE-2018-0732

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 DoS condition on the target system.

The vulnerability exists due to improper handling of large prime values by the affected software during key agreement operations in a Transport Layer Security (TLS) handshake using an Ephemeral Diffie-Hellman (DHE) based cipher suite. A remote attacker can send a large prime value from a malicious OpenSSL server to a targeted OpenSSL client and cause the client to stop responding while generating a key for the prime value.

Mitigation
Update to versions 1.1.0i or 1.0.2p.

Vulnerable software versions

OpenSSL: 1.0.2, 1.0.2a, 1.0.2b, 1.0.2c, 1.0.2d, 1.0.2e, 1.0.2f, 1.0.2g, 1.0.2h, 1.0.2i, 1.0.2j, 1.0.2k, 1.0.2l, 1.0.2m, 1.0.2n, 1.0.2o, 1.1.0, 1.1.0a, 1.1.0b, 1.1.0c, 1.1.0d, 1.1.0e, 1.1.0f, 1.1.0g, 1.1.0h

CPE

External links
https://www.openssl.org/news/secadv/20180612.txt


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.


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