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Ubuntu: USN-5051-1 Crucial: OpenSSL Service Disruption Vulnerabilities

ubuntu
Calendar Grey August 24, 2021
Dist Ubuntu Esm H88
Ubuntu Security Announcement USN-5040-2 relates to various vulnerabilities in OpenSSL impacting Ubuntu 21.10, 20.10, and 18.10 LTS.
Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

- 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)

Topics%20covered

Topics Covered

security advisory denial of service openss issue ubuntu 21.04 ubuntu 20.04 lts ubuntu 18.04 lts

Update Instructions

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

Ubuntu 21.04:
  libssl1.1                       1.1.1j-1ubuntu3.5

Ubuntu 20.04 LTS:
  libssl1.1                       1.1.1f-1ubuntu2.8

Ubuntu 18.04 LTS:
  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

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

CVE-2021-3711, CVE-2021-3712

Severity
critical
Lowest
Low
Medium
High
Critical

August 24, 2021

Topics%20covered

Topics Covered

security advisory denial of service openss issue ubuntu 21.04 ubuntu 20.04 lts ubuntu 18.04 lts

Package Information

https://launchpad.net/ubuntu/+source/openssl/1.1.1j-1ubuntu3.5
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.8
https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.13

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