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osvGoogleOSV:CVE-2019-1559
HistoryFeb 27, 2019 - 11:29 p.m.

CVE-2019-1559

2019-02-2723:29:00
Google
osv.dev
15

AI Score

5.7

Confidence

High

EPSS

0.01

Percentile

83.8%

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 โ€œnon-stitchedโ€ 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).

References