FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

OpenSSL -- Padding oracle vulnerability

Affected packages
openssl < 1.0.2r,1

Details

VuXML ID 7700061f-34f7-11e9-b95c-b499baebfeaf
Discovery 2019-02-19
Entry 2019-02-20
Modified 2019-03-07

The OpenSSL project reports:

0-byte record padding oracle (CVE-2019-1559) (Moderate)
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.

References

CVE Name CVE-2019-1559
URL https://www.openssl.org/news/secadv/20190226.txt