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AUSCERT External Security Bulletin Redistribution
ESB-2021.2861
USN-5051-1: OpenSSL vulnerabilities
25 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Unknown/Unspecified
Access Confidential Data -- Unknown/Unspecified
Reduced Security -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3712 CVE-2021-3711
Original Bulletin:
https://ubuntu.com/security/notices/USN-5051-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running OpenSSL check for an updated version of the software for
their operating system.
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USN-5051-1: OpenSSL vulnerabilities
24 August 2021
Several security issues were fixed in OpenSSL.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
John Ouyang discovered that OpenSSL incorrectly handled decrypting SM2
data. A remote attacker could use this issue to cause applications using
OpenSSL to crash, resulting in a denial of service, or possibly change
application behaviour. ( CVE-2021-3711 )
Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1
strings. A remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly obtain sensitive information.
( CVE-2021-3712 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o libssl1.1 - 1.1.1j-1ubuntu3.5
Ubuntu 20.04
o libssl1.1 - 1.1.1f-1ubuntu2.8
Ubuntu 18.04
o libssl1.1 - 1.1.1-1ubuntu2.1~18.04.13
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-3711
o CVE-2021-3712
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