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AUSCERT External Security Bulletin Redistribution
ESB-2021.1061
USN-4891-1: OpenSSL vulnerability
26 March 2021
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AusCERT Security Bulletin Summary
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Product: OpenSSL
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3449
Reference: ESB-2021.1056
Original Bulletin:
https://ubuntu.com/security/notices/USN-4891-1
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USN-4891-1: OpenSSL vulnerability
25 March 2021
OpenSSL could be made to crash if it received specially
crafted network traffic.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
It was discovered that OpenSSL incorrectly handled certain renegotiation
ClientHello messages. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o libssl1.1 - 1.1.1f-1ubuntu4.3
Ubuntu 20.04
o libssl1.1 - 1.1.1f-1ubuntu2.3
Ubuntu 18.04
o libssl1.1 - 1.1.1-1ubuntu2.1~18.04.9
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-3449
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