Impact: Moderate Public Date: 2019-02-26 CWE: CWE-325 Bugzilla: 1683804: CVE-2019-1559 openssl: 0-byte record padding oracle If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-1559 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | rhvm-appliance | Under investigation |
| Red Hat Virtualization 4 | redhat-virtualization-host | Under investigation |
| Red Hat JBoss Web Server 5 | openssl | Under investigation |
| Red Hat JBoss Web Server 3 | openssl | Under investigation |
| Red Hat JBoss EWS 2 | openssl | Under investigation |
| Red Hat JBoss EAP 6 | openssl | Under investigation |
| Red Hat JBoss EAP 5 | openssl | Under investigation |
| Red Hat JBoss Core Services 1 | openssl | Under investigation |
| Red Hat Enterprise Linux 7 | OVMF | Will not fix |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 7 | openssl | Affected |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 5 | openssl | Under investigation |
| Red Hat Enterprise Linux 5 | openssl097a | Under investigation |
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