Advisory Published

USN-4173-1: FreeTDS vulnerability

First published: Wed Oct 30 2019(Updated: )

Felix Wilhelm discovered that FreeTDS incorrectly handled certain types after a protocol downgrade. A remote attacker could use this issue to cause FreeTDS to crash, resulting in a denial of service, or possibly execute arbitrary code.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/freetds-bin<1.1.6-1ubuntu0.1
1.1.6-1ubuntu0.1
Ubuntu=19.10
All of
ubuntu/libct4<1.1.6-1ubuntu0.1
1.1.6-1ubuntu0.1
Ubuntu=19.10
All of
ubuntu/libsybdb5<1.1.6-1ubuntu0.1
1.1.6-1ubuntu0.1
Ubuntu=19.10
All of
ubuntu/tdsodbc<1.1.6-1ubuntu0.1
1.1.6-1ubuntu0.1
Ubuntu=19.10
All of
ubuntu/freetds-bin<1.00.104-1ubuntu0.1
1.00.104-1ubuntu0.1
Ubuntu=19.04
All of
ubuntu/libct4<1.00.104-1ubuntu0.1
1.00.104-1ubuntu0.1
Ubuntu=19.04
All of
ubuntu/libsybdb5<1.00.104-1ubuntu0.1
1.00.104-1ubuntu0.1
Ubuntu=19.04
All of
ubuntu/tdsodbc<1.00.104-1ubuntu0.1
1.00.104-1ubuntu0.1
Ubuntu=19.04
All of
ubuntu/freetds-bin<1.00.82-2ubuntu0.1
1.00.82-2ubuntu0.1
Ubuntu=18.04
All of
ubuntu/libct4<1.00.82-2ubuntu0.1
1.00.82-2ubuntu0.1
Ubuntu=18.04
All of
ubuntu/libsybdb5<1.00.82-2ubuntu0.1
1.00.82-2ubuntu0.1
Ubuntu=18.04
All of
ubuntu/tdsodbc<1.00.82-2ubuntu0.1
1.00.82-2ubuntu0.1
Ubuntu=18.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4173-1?

    The severity of USN-4173-1 is classified as high due to the potential for remote attackers to cause a denial of service or execute arbitrary code.

  • How do I fix USN-4173-1?

    To fix USN-4173-1, upgrade FreeTDS to version 1.1.6-1ubuntu0.1 or 1.00.104-1ubuntu0.1 for affected Ubuntu releases.

  • Which Ubuntu versions are affected by USN-4173-1?

    USN-4173-1 affects Ubuntu versions 18.04, 19.04, and 19.10.

  • What packages are impacted by USN-4173-1?

    The impacted packages in USN-4173-1 include freetds-bin, libct4, libsybdb5, and tdsodbc.

  • What should I do if I can't upgrade due to USN-4173-1?

    If you cannot upgrade due to USN-4173-1, ensure that network access to the affected components is restricted and monitor for unusual activity.

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