USN-4196-1: python-ecdsa vulnerabilities

Releases

• Ubuntu 19.10
• Ubuntu 19.04
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• python-ecdsa - 0.13-2ubuntu0.18.04.1
• python3-ecdsa - 0.13-2ubuntu0.18.04.1

Ubuntu 16.04

• 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

• CVE-2019-14853
• CVE-2019-14859