ALT-PU-2019-1478-1

Package update openssl10 in branch sisyphus

Version1.0.2r-alt1

Published2019-03-20

Max severityMEDIUM

Severity:

Closed issues (2)

MEDIUM5.9

Уязвимость функции SSL_shutdown средства криптографической защиты OpenSSL, позволяющая нарушителю раскрыть защищаемую информацию

Published: 2019-03-12Modified: 2024-09-30

CVSS 3.xMEDIUM 5.9

CVSS:3.x/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS 2.0HIGH 7.1

CVSS:2.0/AV:N/AC:M/Au:N/C:C/I:N/A:N

References

CVE-2019-1559

MEDIUM5.9

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: 2019-02-27Modified: 2024-11-21

CVSS 2.0MEDIUM 4.3

CVSS:2.0/AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS 3.xMEDIUM 5.9

CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References