==========================================================================
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
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)
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.
References:
https://usn.ubuntu.com/4196-1
CVE-2019-14853, CVE-2019-14859
Package Information:
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-3ubuntu0.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.16.04.1
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