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CVE-2019-1549

Status Candidate

Overview

OpenSSL 1.1.1 introduced a rewritten random number generator (RNG). This was intended to include protection in the event of a fork() system call in order to ensure that the parent and child processes did not share the same RNG state. However this protection was not being used in the default case. A partial mitigation for this issue is that the output from a high precision timer is mixed into the RNG state so the likelihood of a parent and child process sharing state is significantly reduced. If an application already calls OPENSSL_init_crypto() explicitly using OPENSSL_INIT_ATFORK then this problem does not occur at all. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c).

Related Files

Debian Security Advisory 4539-1
Posted Oct 2, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4539-1 - ECDSA, a padding oracle in PKCS7_dataDecode() and CMS_decrypt_set1_pkey() and it was discovered that a feature of the random number generator (RNG) intended to protect against shared RNG state between parent and child processes in the event of a fork() syscall was not used by default.

tags | advisory
systems | linux, debian
advisories | CVE-2019-1547, CVE-2019-1549, CVE-2019-1563
MD5 | cc0d2e9f89e952c84d6d63e3bf53a62c
OpenSSL Toolkit 1.1.1d
Posted Sep 11, 2019
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.

Changes: Fixed a fork protection issue. Added a bypass mitigation. Various other updates.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2019-1547, CVE-2019-1549, CVE-2019-1552, CVE-2019-1563
MD5 | 3be209000dbc7e1b95bcdf47980a3baa
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