Bug 1744670 - hashlib.md5 broken in FIPS mode without workaround available
Summary: hashlib.md5 broken in FIPS mode without workaround available
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: python3
Version: 8.0
Hardware: Unspecified
OS: Unspecified
urgent
urgent
Target Milestone: rc
: 8.0
Assignee: Python Maintainers
QA Contact: Lukáš Zachar
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-22 16:21 UTC by Hubert Kario
Modified: 2019-11-05 22:04 UTC (History)
4 users (show)

Fixed In Version: python3-3.6.8-15.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-11-05 22:03:44 UTC
Type: Bug
Target Upstream Version:


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3520 None None None 2019-11-05 22:04:04 UTC

Description Hubert Kario 2019-08-22 16:21:01 UTC
Description of problem:
It is not possible to use MD5 from hashlib module when system is configured in FIPS mode.

Version-Release number of selected component (if applicable):
python3-libs-3.6.8-14.el8.x86_64
python36-3.6.8-2.module+el8.1.0+3334+5cb623d7.x86_64

How reproducible:
always

Steps to Reproduce:
1. setup system in FIPS mode
2. import hashlib
3. a = hashlib.md5()
4. a = hashlib.md5(usedforsecurity=False)

Actual results:
>>> a = hashlib.md5()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: [digital envelope routines: EVP_DigestInit_ex] disabled for FIPS
>>> a = hashlib.md5(usedforsecurity=False)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: openssl_md5() takes no keyword arguments

Expected results:
>>> a = hashlib.md5()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: error:060800A3:digital envelope routines:EVP_DigestInit_ex:disabled for fips
>>> a = hashlib.md5(usedforsecurity=False)
>>> a
<md5 HASH object @ 0x7f7debab5760>

Additional info:
This is a regression compared to RHEL-7 FIPS mode. Disabling access to MD5 completely in FIPS mode is not the intended goal of FIPS. Only use of MD5 to cryptographically protect data is disallowed in FIPS mode (e.g. RSA signatures with MD5).

Comment 1 Hubert Kario 2019-08-22 16:22:36 UTC
see also bug 1742223

Comment 9 errata-xmlrpc 2019-11-05 22:03:44 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3520


Note You need to log in before you can comment on or make changes to this bug.