PT-2017-3946 · Openssl+3 · Openssl+3

Published 2017-01-30 · Updated 2019-04-23 · CVE-2017-3733

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions OpenSSL versions prior to 1.1.0e

Description The issue is related to insufficient input validation in the Encrypt-Then-Mac extension of the OpenSSL library. This can be exploited by a remote attacker to cause a denial of service, resulting in a crash. The vulnerability is triggered during a renegotiation handshake when the Encrypt-Then-Mac extension is negotiated differently than in the original handshake. Both clients and servers are affected.

Recommendations For OpenSSL versions prior to 1.1.0e, update to version 1.1.0e or later to resolve the issue. As a temporary workaround, consider restricting the use of the Encrypt-Then-Mac extension during renegotiation handshakes until a patch is applied.

Exploit

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

ALT-PU-2017-2639

BDU:2020-02911

CVE-2017-3733

MGASA-2017-0390

Affected Products

Alt Linux

Cisco Wls

Openssl

Virtualbox

References · 46

• 🔥 https://github.com/fundacion-sadosky/vbox_cve_2017_10235 · Exploit
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10236 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10187 · Security Note
• https://errata.altlinux.org/ALT-PU-2017-2639 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10129 · Security Note
• https://openssl.org/news/secadv/20170216.txt · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10238 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2017-3733 · Security Note
• https://bdu.fstec.ru/vul/2020-02911 · Security Note
• https://cve.org/CVERecord?id=CVE-2017-3733 · Security Note
• https://ubuntu.com/security/CVE-2017-3733 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2017-0390 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2017-0390.html · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10240 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10408 · Security Note