Improper Verification of Cryptographic Signature

Overview

Versions of jsrsasignprior to 8.0.17 fail to properly verify cryptographic signatures. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending ‘\0’ bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.

Recommendation

Upgrade to version 8.0.17 or later.

References

• GitHub Issue
• CVE entry
• GitHub Advisory