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).
Published 2019-02-27 23:29:00
Updated 2022-08-19 11:14:33
View at NVD,   CVE.org

Threat overview for CVE-2019-1559

Top countries where our scanners detected CVE-2019-1559
Top open port discovered on systems with this issue 80
IPs affected by CVE-2019-1559 192
Threat actors abusing to this issue? Yes
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Exploit prediction scoring system (EPSS) score for CVE-2019-1559

Probability of exploitation activity in the next 30 days: 0.81%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 81 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2019-1559

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.3
MEDIUM AV:N/AC:M/Au:N/C:P/I:N/A:N
8.6
2.9
NIST
5.9
MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.2
3.6
NIST

CWE ids for CVE-2019-1559

  • The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-1559

Products affected by CVE-2019-1559

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