1. Ubuntu Security Notices
  2. USN-3199-3

USN-3199-3: Python Crypto vulnerability

Publication date

28 August 2017

Overview

Programs using the Python Cryptography Toolkit could be made to crash or run programs if they receive specially crafted network traffic or other input.

Releases

Packages

  • python-crypto - cryptographic algorithms and protocols for Python

Details

USN-3199-1 fixed a vulnerability in Python Crypto. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that the ALGnew function in block_templace.c in the Python
Cryptography Toolkit contained a heap-based buffer overflow vulnerability.
A remote attacker could use this flaw to execute arbitrary code by using
a crafted initialization vector parameter.

USN-3199-1 fixed a vulnerability in Python Crypto. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that the ALGnew function in block_templace.c in the Python
Cryptography Toolkit contained a heap-based buffer overflow vulnerability.
A remote attacker could use this flaw to execute arbitrary code by using
a crafted initialization vector parameter.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
12.04 precise python3-crypto –  2.4.1-1ubuntu0.2
python-crypto –  2.4.1-1ubuntu0.2

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References

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