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Ubuntu Security Notice USN-4740-1
February 18, 2021

shiro vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Apache Shiro could be made to crash if it received specially crafted
input.

Software Description:
- shiro: Powerful and easy-to-use Java security framework

Details:

It was discovered that Apache Shiro mishandled specially crafted requests. An
attacker could use this vulnerability to bypass authentication mechanisms.

Update instructions:

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

Ubuntu 20.04 LTS:
  libshiro-java                   1.3.2-4ubuntu0.1

Ubuntu 18.04 LTS:
  libshiro-java                   1.3.2-3~18.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4740-1
  CVE-2020-11989, CVE-2020-1957

Package Information:
  https://launchpad.net/ubuntu/+source/shiro/1.3.2-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/shiro/1.3.2-3~18.04.1