- Vulnerability/
- USN-4376-1
USN-4376-1: OpenSSL vulnerabilities
First published: Thu May 28 2020(Updated: )
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. (CVE-2019-1547) Matt Caswell discovered that OpenSSL incorrectly handled the random number generator (RNG). 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. (CVE-2019-1549) Guido Vranken discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. (CVE-2019-1551) Bernd Edlinger discovered that OpenSSL incorrectly handled certain decryption functions. In certain scenarios, a remote attacker could possibly use this issue to perform a padding oracle attack and decrypt traffic. (CVE-2019-1563)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/libssl1.1 | <1.1.1c-1ubuntu4.1 | 1.1.1c-1ubuntu4.1 |
| Ubuntu Linux | =19.10 | |
| All of | ||
| ubuntu/libssl1.1 | <1.1.1-1ubuntu2.1~18.04.6 | 1.1.1-1ubuntu2.1~18.04.6 |
| Ubuntu Linux | =18.04 | |
| All of | ||
| ubuntu/libssl1.0.0 | <1.0.2g-1ubuntu4.16 | 1.0.2g-1ubuntu4.16 |
| Ubuntu Linux | =16.04 |
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Reference Links
- https://ubuntu.com/security/CVE-2019-1547
- https://ubuntu.com/security/CVE-2019-1549
- https://ubuntu.com/security/CVE-2019-1551
- https://ubuntu.com/security/CVE-2019-1563
- https://ubuntu.com/security/notices/USN-4376-2
- https://ubuntu.com/security/notices/USN-4504-1
- https://launchpad.net/ubuntu/+source/openssl/1.1.1c-1ubuntu4.1
- https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.6
- https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.16
- https://ubuntu.com/security/notices/USN-4376-1 (Advisory)
Child vulnerabilities
(Contains the following vulnerabilities)
Frequently Asked Questions
What is the vulnerability ID for this advisory?
The vulnerability ID for this advisory is CVE-2019-1547.
What is the severity of CVE-2019-1547?
The severity of CVE-2019-1547 is high.
How does the OpenSSL vulnerability CVE-2019-1547 affect Ubuntu 19.10?
The OpenSSL vulnerability CVE-2019-1547 affects Ubuntu 19.10 if the version of libssl1.1 is 1.1.1c-1ubuntu4.1 or earlier.
How can I fix OpenSSL vulnerability CVE-2019-1547 on Ubuntu 19.10?
To fix the OpenSSL vulnerability CVE-2019-1547 on Ubuntu 19.10, you need to update libssl1.1 to version 1.1.1c-1ubuntu4.2 or later.
Where can I find more information about the OpenSSL vulnerabilities mentioned in this advisory?
You can find more information about the OpenSSL vulnerabilities mentioned in this advisory on the Ubuntu security website.
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