VulnerabilityModified
CVE-2017-3733
During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL 1.1.0 before 1.1.0e to crash (dependent on ciphersuite).
HIGH 7.5EPSS 12.9%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.9%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL 1.1.0 before 1.1.0e to crash (dependent on ciphersuite). Both clients and servers are affected.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 12.87% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- openssl/openssl · hp/operations agent
- Source
- openssl-security@openssl.org
References
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.securityfocus.com/bid/96269Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037846
- https://github.com/openssl/openssl/commit/4ad93618d26a3ea23d36ad5498ff4f59eff3a4d2
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03728en_usThird Party Advisory, VDB Entry
- https://www.openssl.org/news/secadv/20170216.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.securityfocus.com/bid/96269Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037846
- https://github.com/openssl/openssl/commit/4ad93618d26a3ea23d36ad5498ff4f59eff3a4d2
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03728en_usThird Party Advisory, VDB Entry
- https://www.openssl.org/news/secadv/20170216.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.