OpenSSL up to 0.9.8/1.0.0q/1.0.1l/1.0.2 SSLv2 s2_srvr.c get_client_master_key CLIENT-MASTER-KEY CLEAR-KEY-LENGTH information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability, which was classified as critical, was found in OpenSSL up to 0.9.8/1.0.0q/1.0.1l/1.0.2 (Network Encryption Software). Affected is the function get_client_master_key of the file s2_srvr.c of the component SSLv2 Handler. The manipulation of the argument CLIENT-MASTER-KEY CLEAR-KEY-LENGTH with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 03/02/2016 by Alex with University of Michigan (Website). The advisory is available at This vulnerability is traded as CVE-2016-0703 since 12/16/2015. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 82783 (CentOS 5 : openssl (CESA-2015:0800) (FREAK)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350021 (Amazon Linux Security Advisory for openssl098e: ALAS-2016-682).

Upgrading to version 0.9.8zf, 1.0.0r, 1.0.1m or 1.0.2a eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 83743), X-Force (111145), Vulnerability Center (SBV-56994) and Tenable (82783). See 68520, 74747, 81112 and 81139 for similar entries.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.9
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 82783
Nessus Name: CentOS 5 : openssl (CESA-2015:0800) (FREAK)
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OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-682
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfoedit

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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSL 0.9.8zf/1.0.0r/1.0.1m/1.0.2a


04/14/2015 🔍
04/15/2015 +1 days 🔍
12/16/2015 +245 days 🔍
02/29/2016 +75 days 🔍
03/01/2016 +1 days 🔍
03/02/2016 +0 days 🔍
03/02/2016 +0 days 🔍
03/03/2016 +1 days 🔍
03/05/2016 +2 days 🔍
02/13/2017 +345 days 🔍
09/01/2018 +564 days 🔍



Researcher: Alex
Organization: University of Michigan
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0703 (🔍)

SecurityFocus: 83743 - OpenSSL CVE-2016-0703 Information Disclosure Vulnerability
X-Force: 111145 - OpenSSL s2_srvr.c security bypass
Vulnerability Center: 56994 - OpenSSL Remote Session Key Recovery in SSLv2 - CVE-2016-0703, Medium

See also: 🔍


Created: 03/03/2016 10:19 AM
Updated: 09/01/2018 08:38 AM
Changes: (25) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_person_nickname advisory_company_name advisory_confirm_url countermeasure_date source_oval_id source_securityfocus_date source_securityfocus_class source_openvas_id source_openvas_filename source_openvas_title source_openvas_family
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