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Ubuntu 25.04 Lasso Critical Denial of Service Vulnerabilities USN-7872-1

ubuntu
Calendar Grey November 18, 2025
Dist Ubuntu Esm H88
Ensure your Ubuntu system is secure by addressing critical Lasso issues affecting multiple releases urgently.
Several security issues were fixed in Lasso.

Summary

Several security issues were fixed in Lasso.

Software Description:

- lasso: Liberty Alliance and SAML protocol Library

Details:

It was discovered that Lasso incorrectly handled certain malformed SAML

responses. A remote attacker could possibly use this issue to cause Lasso

to crash, resulting in a denial of service. (CVE-2025-46404)

It was discovered that Lasso incorrectly handled certain malformed SAML

assertion responses. A remote attacker could possibly use this issue to

cause Lasso to crash, resulting in a denial of service. (CVE-2025-46705)

It was discovered that Lasso incorrectly handled certain malformed SAML

responses. A remote attacker could possibly use this issue to cause Lasso

to consume memory, resulting in a denial of service. This issue only

affected Ubuntu 22.04 LTS. (CVE-2025-46784)

It was discovered that Lasso incorrectly handled certain malformed SAML

responses. A remote attacker could use this issue to cause Lasso to crash,

resulting in a denial of service...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu lasso malformed response

Update Instructions

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

Ubuntu 25.04
  liblasso-perl                   2.8.2-8ubuntu0.1
  liblasso3t64                    2.8.2-8ubuntu0.1
  python3-lasso                   2.8.2-8ubuntu0.1

Ubuntu 24.04 LTS
  liblasso-perl                   2.8.2-2ubuntu0.1
  liblasso3t64                    2.8.2-2ubuntu0.1
  python3-lasso                   2.8.2-2ubuntu0.1

Ubuntu 22.04 LTS
  liblasso-perl                   2.7.0-2ubuntu0.1
  liblasso3                       2.7.0-2ubuntu0.1
  python3-lasso                   2.7.0-2ubuntu0.1

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

References

https://ubuntu.com/security/notices/USN-7872-1

CVE-2025-46404, CVE-2025-46705, CVE-2025-46784, CVE-2025-47151

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7872-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu lasso malformed response

Package Information

https://launchpad.net/ubuntu/+source/lasso/2.8.2-8ubuntu0.1
https://launchpad.net/ubuntu/+source/lasso/2.8.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/lasso/2.7.0-2ubuntu0.1

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