Piwigo Web Photo Gallery: Secret Key Easily Guessable

Summary

Piwigo versions 14.x have a weak secret key that can be guessed in under an hour. This could allow an attacker to access sensitive information or perform actions on your photo gallery. To fix this, update to version 15.0.0 or later.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions	Fix available
piwigo	piwigo	> 14.0.0 , <= 14.5.0	–

Original title

Piwigo is an open source photo gallery application for the web. In versions on the 14.x branch, when installing, the secret_key configuration parameter is set to MD5(RAND()) in MySQL. However, RAND...

Original description

Piwigo is an open source photo gallery application for the web. In versions on the 14.x branch, when installing, the secret_key configuration parameter is set to MD5(RAND()) in MySQL. However, RAND() only has 30 bits of randomness, making it feasible to brute-force the secret key. The CSRF token is constructed partially from the secret key, and this can be used to check if the brute force succeeded. Trying all possible values takes approximately one hour. The impact of this is limited. The auto login key uses the user's password on top of the secret key. The pwg token uses the user's session identifier on top of the secret key. It seems that values for get_ephemeral_key can be generated when one knows the secret key. Version 15.0.0 contains a fix for the issue.

nvd CVSS3.1 7.5

nvd CVSS4.0 2.7

Vulnerability type

CWE-330 Use of Insufficiently Random Values