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AUSCERT External Security Bulletin Redistribution
ESB-2020.1889
USN-4376-1: OpenSSL vulnerabilities
29 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1563 CVE-2019-1551 CVE-2019-1549
CVE-2019-1547
Reference: ASB-2020.0018
ESB-2019.3530
ESB-2019.3480
ESB-2019.3389
Original Bulletin:
https://usn.ubuntu.com/4376-1/
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USN-4376-1: OpenSSL vulnerabilities
28 May 2020
openssl vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in OpenSSL.
Software Description
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
Cesar Pereida GarcA-a, 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)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
libssl1.1 - 1.1.1c-1ubuntu4.1
Ubuntu 18.04 LTS
libssl1.1 - 1.1.1-1ubuntu2.1~18.04.6
Ubuntu 16.04 LTS
libssl1.0.0 - 1.0.2g-1ubuntu4.16
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to reboot your computer to make all the
necessary changes.
References
o CVE-2019-1547
o CVE-2019-1549
o CVE-2019-1551
o CVE-2019-1563
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