CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
99.2%
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.
Vendor | Product | Version | CPE |
---|---|---|---|
openssl | openssl | 1.0.2b | cpe:2.3:a:openssl:openssl:1.0.2b:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2c | cpe:2.3:a:openssl:openssl:1.0.2c:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2d | cpe:2.3:a:openssl:openssl:1.0.2d:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2e | cpe:2.3:a:openssl:openssl:1.0.2e:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2f | cpe:2.3:a:openssl:openssl:1.0.2f:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2g | cpe:2.3:a:openssl:openssl:1.0.2g:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2h | cpe:2.3:a:openssl:openssl:1.0.2h:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2i | cpe:2.3:a:openssl:openssl:1.0.2i:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2j | cpe:2.3:a:openssl:openssl:1.0.2j:*:*:*:*:*:*:* |
openssl | openssl | 1.0.2k | cpe:2.3:a:openssl:openssl:1.0.2k:*:*:*:*:*:*:* |
www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
www.securityfocus.com/bid/102103
www.securitytracker.com/id/1039978
access.redhat.com/errata/RHSA-2018:0998
access.redhat.com/errata/RHSA-2018:2185
access.redhat.com/errata/RHSA-2018:2186
access.redhat.com/errata/RHSA-2018:2187
cert-portal.siemens.com/productcert/pdf/ssa-179516.pdf
github.com/openssl/openssl/commit/898fb884b706aaeb283de4812340bb0bde8476dc
security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc
security.gentoo.org/glsa/201712-03
security.netapp.com/advisory/ntap-20171208-0001/
security.netapp.com/advisory/ntap-20180117-0002/
security.netapp.com/advisory/ntap-20180419-0002/
www.debian.org/security/2017/dsa-4065
www.digitalmunition.me/2017/12/cve-2017-3737-openssl-security-bypass-vulnerability/
www.openssl.org/news/secadv/20171207.txt
www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
www.tenable.com/security/tns-2017-16
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
99.2%