[USN-4196-1] python-ecdsa vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Mon Nov 18 14:18:20 UTC 2019

Ubuntu Security Notice USN-4196-1
November 18, 2019

python-ecdsa vulnerabilities

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


Several security issues were fixed in python-ecdsa.

Software Description:
- python-ecdsa: ECDSA cryptographic signature library


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.

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)

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.

  CVE-2019-14853, CVE-2019-14859

Package Information:

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