[ASA-201906-6] lib32-openssl: information disclosure
foxboron at archlinux.org
Thu Jun 13 14:46:45 UTC 2019
Arch Linux Security Advisory ASA-201906-6
Date : 2019-06-11
CVE-ID : CVE-2019-1543
Package : lib32-openssl
Type : information disclosure
Remote : Yes
Link : https://security.archlinux.org/AVG-920
The package lib32-openssl before version 1:1.1.1.c-1 is vulnerable to
Upgrade to 1:1.1.1.c-1.
# pacman -Syu "lib32-openssl>=1:1.1.1.c-1"
The problem has been fixed upstream in version 1.1.1.c.
An issue has been found in OpenSSL <= 1.1.1b, where an application
using ChaCha20-Poly1305 could set a non-default nonce length to be
longer than 12 bytes and then mistakenly reuse a nonce.
ChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input
for every encryption operation. RFC 7539 specifies that the nonce value
(IV) should be 96 bits (12 bytes). OpenSSL allows a variable nonce
length and front pads the nonce with 0 bytes if it is less than 12
bytes. However it also incorrectly allows a nonce to be set of up to 16
bytes. In this case only the last 12 bytes are significant and any
additional leading bytes are ignored.
A remote attacker could disclose sensitive information via an invalid
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