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Opened 2 years ago

Last modified 11 months ago

#44628 new defect (bug)

Repair DB rehashes password to md5

Reported by: yani.iliev Owned by:
Milestone: Future Release Priority: normal
Severity: normal Version:
Component: Upgrade/Install Keywords: has-patch needs-testing
Focuses: Cc:

Description

How to replicate:

Corrupt the database:

truncate $wpdb->options;
insert into $wpdb->options (option_name, option_value) values('siteurl', 'http://localhost');

Navigate to http://localhost/ and repair the database.

Observe user_pass for all users in $wpdb->users it is now md5 hash.

Attachments (1)

44628.diff (1.0 KB) - added by jbcomte35 20 months ago.
Diff file

Download all attachments as: .zip

Change History (7)

#1 @yani.iliev
2 years ago

The code that rehashes the password is in https://core.trac.wordpress.org/browser/trunk/src/wp-admin/includes/upgrade.php?annotate=blame#L889

upgrade_110 is used to convert plaintext passwords to md5, however, the hash has changed in the most recent versions of WordPress and the regex needs updating.
wp_check_password uses

<?php
if ( strlen($hash) <= 32 ) {

to check if the hash is md5 but ideally it should be === because md5 is always 32 characters.
https://core.trac.wordpress.org/browser/tags/4.9.7/src/wp-includes/pluggable.php#L2237

if password length < 32 hash password with md5

if password length === 32 check if the string has all valid md5 characters

if the password has valid md5 characters, assume it is md5 checksum

else assume it is not hashed and md5 hash it

if the password is > 32 characters do not hash it.

#2 @pento
23 months ago

  • Component changed from Database to Upgrade/Install
  • Keywords needs-patch added
  • Milestone changed from Awaiting Review to Future Release
  • Version trunk deleted

#3 @jbcomte35
20 months ago

I'm on it, i'll push a .diff file within few days

Last edited 20 months ago by jbcomte35 (previous) (diff)

@jbcomte35
20 months ago

Diff file

#4 @jbcomte35
20 months ago

  • Keywords has-patch added; needs-patch removed

#5 @jbcomte35
20 months ago

  • Keywords needs-testing added

#6 @bookdude13
11 months ago

Hi everyone! This is my first post, so let me know if I'm doing anything wrong.

I tried to reproduce this using the steps above, except I did the commands directly in phpMyAdmin. This left me with a blank site, no db corruption. I then put

  define( 'WP_DEBUG', true );

in my wp-config.php file and tried repairing the database at http://localhost/wordpress-svn/src/wp-admin/maint/repair.php. The repairs didn't change the wp_users hashes. I also tried corrupting the wp_options data file directly with a few values, and this either caused the whole db server to crash or didn't make noticeable impacts. Repairing afterwards didn't change the hashes.

It looks like the function that was causing the issue and that this patch addresses is only called with db version < 2541 (WP 1.5?). See wp-admin\includes\upgrade.php, lines 725-728. The current db version is around 47018.

Tl;dr I couldn't reproduce on trunk, the repro steps should be updated, and future testing should be done w/ an older version of wordpress.

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