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Ubuntu Security Notice USN-4196-1

Ubuntu Security Notice USN-4196-1
Posted Nov 18, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4196-1 - 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, python
systems | linux, ubuntu
advisories | CVE-2019-14853, CVE-2019-14859
MD5 | 35e3a03b9cd2e11397dc1e4198d7fb7b

Ubuntu Security Notice USN-4196-1

Change Mirror Download
==========================================================================
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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