Ubuntu 19.10: 4196-1 Moderate: Python-Ecdsa Denial Of Service

ubuntu

November 18, 2019

Several security issues were fixed in python-ecdsa.

Summary

Several security issues were fixed in python-ecdsa.

Software Description:

- python-ecdsa: ECDSA cryptographic signature library

Details:

It was discovered that python-ecdsa incorrectly handled certain signatures.

A remote attacker could possibly use this issue to cause python-ecdsa to

generate unexpected exceptions, resulting in a denial of service.

(CVE-2019-14853)

It was discovered that python-ecdsa incorrectly verified DER encoding in

signatures. A remote attacker could use this issue to perform certain

malleability attacks. (CVE-2019-14859)

Topics Covered

security advisory denial of service software update Ubuntu remote attacker python-ecdsa malleability

Update Instructions

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

Ubuntu 19.10:
  python-ecdsa                    0.13.2-2ubuntu0.1
  python3-ecdsa                   0.13.2-2ubuntu0.1

Ubuntu 19.04:
  python-ecdsa                    0.13-3ubuntu0.1
  python3-ecdsa                   0.13-3ubuntu0.1

Ubuntu 18.04 LTS:
  python-ecdsa                    0.13-2ubuntu0.18.04.1
  python3-ecdsa                   0.13-2ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  python-ecdsa                    0.13-2ubuntu0.16.04.1
  python3-ecdsa                   0.13-2ubuntu0.16.04.1

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