Operating System:

[Ubuntu]

Published:

19 November 2019

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.4372
                 USN-4196-1: python-ecdsa vulnerabilities
                             19 November 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           python-ecdsa
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Denial of Service              -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-14859 CVE-2019-14853 

Reference:         ESB-2019.4090
                   ESB-2019.4035

Original Bulletin: 
   https://usn.ubuntu.com/4196-1/

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USN-4196-1: python-ecdsa vulnerabilities
18 November 2019

python-ecdsa vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.10
  o Ubuntu 19.04
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in python-ecdsa.

Software Description

  o 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)

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

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o CVE-2019-14853
  o CVE-2019-14859

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