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Ubuntu 18.04 LTS: USN-5051-3 High Severity OpenSSL Denial Of Service

ubuntu
Calendar Grey August 26, 2021
Dist Ubuntu Esm H88
The Ubuntu Security Notice USN-5052-4 tackles a critical vulnerability in the OpenSSL library that could lead to system instability and potential data leaks.
OpenSSL could be made to crash or expose sensitive information if it received a specially crafted ASN.1 string.

Summary

OpenSSL could be made to crash or expose sensitive information

if it received a specially crafted ASN.1 string.

Software Description:

- 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)

Topics%20covered

Topics Covered

security advisory denial of service high severity ubuntu openssl

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  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

https://ubuntu.com/security/notices/USN-5051-3

https://ubuntu.com/security/notices/USN-5051-1

CVE-2021-3712

August 26, 2021

Topics%20covered

Topics Covered

security advisory denial of service high severity ubuntu openssl

Package Information

https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.7

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