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AUSCERT External Security Bulletin Redistribution
ESB-2021.2895
USN-5051-2: OpenSSL vulnerability
27 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: openssl
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3712
Reference: ESB-2021.2891
ESB-2021.2890
ESB-2021.2885
ESB-2021.2864
Original Bulletin:
https://ubuntu.com/security/notices/USN-5051-2
https://ubuntu.com/security/notices/USN-5051-3
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-5051-2: OpenSSL vulnerability
26 August 2021
OpenSSL could be made to crash or expose sensitive information
if it received a specially crafted ASN.1 string.
Releases
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o openssl - Secure Socket Layer (SSL) cryptographic library and tools
Details
USN-5051-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
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 16.04
o libssl1.0.0 - 1.0.2g-1ubuntu4.20+esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o libssl1.0.0 - 1.0.1f-1ubuntu2.27+esm3
Available with UA Infra or UA Desktop
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-3712
Related notices
o USN-5051-1 : libssl-dev, libssl-doc, openssl, libssl1.1
o USN-5051-3 : libssl1.0-dev, openssl1.0, libssl1.0.0
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USN-5051-3: OpenSSL vulnerability
26 August 2021
OpenSSL could be made to crash or expose sensitive information
if it received a specially crafted ASN.1 string.
Releases
o Ubuntu 18.04 LTS
Packages
o openssl1.0 - Secure Socket Layer (SSL) cryptographic library and tools
Details
USN-5051-1 fixed a vulnerability in OpenSSL. This update provides the
corresponding update for the openssl1.0 package in Ubuntu 18.04 LTS.
Original advisory details:
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 18.04
o libssl1.0.0 - 1.0.2n-1ubuntu5.7
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-3712
Related notices
o USN-5051-1 : libssl1.1, libssl-dev, openssl, libssl-doc
o USN-5051-2 : libssl-dev, openssl, libssl-doc, libssl1.0.0
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