CVE-2024-21484: kjur jsrsasign Observable Discrepancy

Vulnerability summary

CVE-2024-21484 is a high (CVSS 7.5) Observable Discrepancy vulnerability in kjur jsrsasign. EPSS estimates a 0.96% chance of exploitation in the next 30 days, higher than 60.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 22-01-2024
   PublishedVulnerability first disclosed.
2. 21-10-2024
   Last modifiedVulnerability information updated.

Description

Versions of the package jsrsasign before 11.0.0 are vulnerable to Observable Discrepancy via the RSA PKCS1.5 or RSAOAEP decryption process. An attacker can decrypt ciphertexts by exploiting the Marvin security flaw. Exploiting this vulnerability requires the attacker to have access to a large number of ciphertexts encrypted with the same key. Workaround The vulnerability can be mitigated by finding and replacing RSA and RSAOAEP decryption with another crypto library.

• CWE-203Observable DiscrepancyThe product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.