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Vulnerability Details : CVE-2017-3737

OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.
Publish Date : 2017-12-07 Last Update Date : 2019-10-03
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 125

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2018:0998: openssl security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20180998 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2017-3737

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 Application Openssl Openssl 1.0.2l * * * Version Details Vulnerabilities
3 Application Openssl Openssl 1.0.2i * * * Version Details Vulnerabilities
4 Application Openssl Openssl 1.0.2m * * * Version Details Vulnerabilities
5 Application Openssl Openssl 1.0.2f * * * Version Details Vulnerabilities
6 Application Openssl Openssl 1.0.2b * * * Version Details Vulnerabilities
7 Application Openssl Openssl 1.0.2c * * * Version Details Vulnerabilities
8 Application Openssl Openssl 1.0.2g * * * Version Details Vulnerabilities
9 Application Openssl Openssl 1.0.2j * * * Version Details Vulnerabilities
10 Application Openssl Openssl 1.0.2d * * * Version Details Vulnerabilities
11 Application Openssl Openssl 1.0.2k * * * Version Details Vulnerabilities
12 Application Openssl Openssl 1.0.2e * * * Version Details Vulnerabilities
13 Application Openssl Openssl 1.0.2h * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Openssl Openssl 12

- References For CVE-2017-3737
REDHAT RHSA-2018:0998
REDHAT RHSA-2018:2186
GENTOO GLSA-201712-03
BID 102103 OpenSSL CVE-2017-3737 Security Bypass Vulnerability Release Date:2018-10-15 CONFIRM CONFIRM

- Metasploit Modules Related To CVE-2017-3737

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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