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CVE
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CVE-2017-3737Date: (C)2017-12-09   (M)2024-02-01


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 5.9CVSS Score : 4.3
Exploit Score: 2.2Exploit Score: 8.6
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: HIGHAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: NONE
Integrity: NONE 
Availability: NONE 
  
Reference:
BID-102103
SECTRACK-1039978
DSA-4065
FreeBSD-SA-17:12
GLSA-201712-03
RHSA-2018:0998
RHSA-2018:2185
RHSA-2018:2186
RHSA-2018:2187
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
https://cert-portal.siemens.com/productcert/pdf/ssa-179516.pdf
https://github.com/openssl/openssl/commit/898fb884b706aaeb283de4812340bb0bde8476dc
https://security.netapp.com/advisory/ntap-20171208-0001/
https://security.netapp.com/advisory/ntap-20180117-0002/
https://security.netapp.com/advisory/ntap-20180419-0002/
https://www.digitalmunition.me/2017/12/cve-2017-3737-openssl-security-bypass-vulnerability/
https://www.openssl.org/news/secadv/20171207.txt
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://www.tenable.com/security/tns-2017-16

CPE    6
cpe:/o:debian:debian_linux:9.0
cpe:/a:openssl:openssl:1.0.2b
cpe:/a:openssl:openssl:1.0.2d
cpe:/a:openssl:openssl:1.0.2c
...
CWE    1
CWE-125
OVAL    19
oval:org.secpod.oval:def:1600886
oval:org.secpod.oval:def:1800136
oval:org.secpod.oval:def:60334
oval:org.secpod.oval:def:89044808
...

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