SUSE-SU-2019:1362-1

Описание

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).

Затронутые продукты

Ссылки

• https://www.suse.com/security/cve/CVE-2019-1559.html
  CVE-2019-1559
• https://bugzilla.suse.com/1127080
  SUSE Bug 1127080
• https://bugzilla.suse.com/1130039
  SUSE Bug 1130039
• https://bugzilla.suse.com/1141798
  SUSE Bug 1141798