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AUSCERT External Security Bulletin Redistribution
ESB-2021.0670
USN-4745-1: OpenSSL vulnerabilities
24 February 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 -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23841 CVE-2020-1971
Reference: ESB-2021.0613
ESB-2020.4514
ESB-2020.4320
Original Bulletin:
https://ubuntu.com/security/notices/USN-4745-1
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USN-4745-1: OpenSSL vulnerabilities
23 February 2021
Several security issues were fixed in OpenSSL.
Releases
o Ubuntu 14.04 ESM
o Ubuntu 12.04
Packages
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
David Benjamin discovered that OpenSSL incorrectly handled comparing
certificates containing a EDIPartyName name type. A remote attacker could
possibly use this issue to cause OpenSSL to crash, resulting in a denial of
service. ( CVE-2020-1971 )
Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer
fields. A remote attacker could possibly use this issue to cause OpenSSL to
crash, resulting in a denial of service. ( CVE-2021-23841 )
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+esm2
Ubuntu 12.04
o libssl1.0.0 - 1.0.1-4ubuntu5.45
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-23841
o CVE-2020-1971
Related notices
o USN-4662-1 : openssl1.0, libssl1.1, libssl1.0.0, openssl
o USN-4738-1 : openssl1.0, libssl1.1, libssl1.0.0, openssl
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