libssl1.0.0: If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify,...
CVE-2019-1559 is fixed in 2 products on 1 platform, first by libssl1.0.0 1.0.2n-1ubuntu5.3, released February 25, 2019. It is not reported as exploited. Patch Radar priority: Routine.
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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssl1.0.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.3 | libssl1.0.0 1.0.2n-1ubuntu5.3 | Feb 25, 2019 |
| openssl1.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.3 | openssl1.0 1.0.2n-1ubuntu5.3 | Feb 25, 2019 |
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