[ASA-201903-2] openssl-1.0: information disclosure
foxboron at archlinux.org
Mon Mar 4 08:54:31 UTC 2019
Arch Linux Security Advisory ASA-201903-2
Date : 2019-03-02
CVE-ID : CVE-2019-1559
Package : openssl-1.0
Type : information disclosure
Remote : Yes
Link : https://security.archlinux.org/AVG-917
The package openssl-1.0 before version 1.0.2.r-1 is vulnerable to
Upgrade to 1.0.2.r-1.
# pacman -Syu "openssl-1.0>=1.0.2.r-1"
The problem has been fixed upstream in version 1.0.2.r.
A padding oracle has been found in OpenSSL versions prior to 1.0.2r.
This issue does not impact OpenSSL 1.1.1 or 1.1.0. 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
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). AEAD ciphersuites
are not impacted.
A remote attacker might be able to use a padding oracle to decrypt
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