Vulnerability identifier: #VU8487

Vulnerability risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:W/RC:C]

CVE-ID: CVE-2017-3735

CWE-ID: CWE-125

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 spoofing attack.

The vulnerability exists due to one-byte out-of-bounds read when parsing an IPAddressFamily extension in an X.509 certificate. A remote attacker can disguise text display of the certificate.

Mitigation
Update to version 1.0.2m or 1.1.0g.

Vulnerable software versions

OpenSSL: 1.1.0 - 1.1.0f, 1.0.2 - 1.0.2l, 1.0.1 - 1.0.1u, 0.9.8 - 0.9.8zg, 1.0.0 - 1.0.0s, 0.9.1b - 0.9.1c, 0.9.0b, 1.0, 0.9.7 - 0.9.7m, 0.9.3 - 0.9.3a, 0.9.5 - 0.9.5a, 0.9.2b, 0.9.4, 0.9.6 - 0.9.6m

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External links
http://www.openssl.org/news/secadv/20170828.txt
http://www.openssl.org/news/secadv/20171102.txt

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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.