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AUSCERT External Security Bulletin Redistribution
ESB-2020.2383
USN-4376-2: OpenSSL vulnerabilities
15 July 2020
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AusCERT Security Bulletin Summary
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Product: OpenSSL
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1563 CVE-2019-1559 CVE-2019-1547
Reference: ESB-2019.2966
ESB-2019.2173
ESB-2019.2172
Original Bulletin:
https://usn.ubuntu.com/4376-2/
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USN-4376-2: OpenSSL vulnerabilities
09 July 2020
openssl vulnerabilities
Releases
o Ubuntu 14.04 ESM
o Ubuntu 12.04 ESM
Packages
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
USN-4376-1 fixed several vulnerabilities in OpenSSL. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
Cesar Pereida Garcia, 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)
Juraj Somorovsky, Robert Merget, and Nimrod Aviram discovered that certain
applications incorrectly used OpenSSL and could be exposed to a padding
oracle attack. A remote attacker could possibly use this issue to decrypt
data. (CVE-2019-1559)
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 14.04
o libssl1.0.0 - 1.0.1f-1ubuntu2.27+esm1
Ubuntu 12.04
o libssl1.0.0 - 1.0.1-4ubuntu5.44
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2019-1547
o CVE-2019-1559
o CVE-2019-1563
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