[USN-4478-1] Python-RSA vulnerability

Eduardo Barretto eduardo.barretto at canonical.com
Mon Aug 31 18:41:26 UTC 2020

Ubuntu Security Notice USN-4478-1
August 31, 2020

python-rsa vulnerability

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

- Ubuntu 14.04 ESM


Python-RSA could be made to expose sensitive information over the

Software Description:
- python-rsa: Pure-Python RSA implementation (Python 2)


It was discovered that Python-RSA incorrectly handled certain ciphertexts.
An attacker could possibly use this issue to obtain sensitive information.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
  python-rsa                      3.1.2-1ubuntu0.1+esm1
  python3-rsa                     3.1.2-1ubuntu0.1+esm1

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

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