#VU8487 Out-of-bounds read in OpenSSL - CVE-2017-3735

Vulnerability identifier: #VU8487

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

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: 0.9.0b, 0.9.1c - 0.9.1b, 0.9.2b, 0.9.3a - 0.9.3, 0.9.4, 0.9.5a - 0.9.5, 0.9.6k - 0.9.6, 0.9.7k - 0.9.7, 0.9.8m - 0.9.8p, 1.0, 1.0.0m - 1.0.0p, 1.0.1l - 1.0.1p, 1.0.2h - 1.0.2, 1.1.0e - 1.1.0

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