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CVE-2019-1551

Status Candidate

Overview

There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).

Related Files

Ubuntu Security Notice USN-4504-1
Posted Sep 16, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4504-1 - Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky discovered that certain Diffie-Hellman ciphersuites in the TLS specification and implemented by OpenSSL contained a flaw. A remote attacker could possibly use this issue to eavesdrop on encrypted communications. This was fixed in this update by removing the insecure ciphersuites from OpenSSL. Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL incorrectly handled ECDSA signatures. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. This issue only affected Ubuntu 18.04 LTS. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2019-1547, CVE-2019-1551, CVE-2019-1563, CVE-2020-1968
MD5 | f3b44e23570e906ce90abb2252627ce0
Ubuntu Security Notice USN-4376-1
Posted May 28, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4376-1 - It was discovered that OpenSSL incorrectly handled ECDSA signatures. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. Matt Caswell discovered that OpenSSL incorrectly handled the random number generator. This may result in applications that use the fork system call sharing the same RNG state between the parent and the child, contrary to expectations. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.10.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2019-1547, CVE-2019-1549, CVE-2019-1551, CVE-2019-1563
MD5 | f989c11ebb96bde96d6e47a9686c7190
Gentoo Linux Security Advisory 202004-10
Posted Apr 23, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202004-10 - Multiple vulnerabilities were found in OpenSSL, the worst of which could allow remote attackers to cause a Denial of Service condition. Versions less than 1.1.1g are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2019-1551, CVE-2020-1967
MD5 | d6eec0e6280df7cdc91181ee629005ca
Debian Security Advisory 4594-1
Posted Dec 30, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4594-1 - Guido Vranken discovered an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli.

tags | advisory, overflow
systems | linux, debian
advisories | CVE-2019-1551
MD5 | d2c9dfa6cac8f0059915a20ae1281999
Slackware Security Advisory - openssl Updates
Posted Dec 26, 2019
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssl packages are available for Slackware 14.2 and -current to fix a security issue.

tags | advisory
systems | linux, slackware
advisories | CVE-2019-1551
MD5 | f97949f975467cbb5a596ccce3b7da0d
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