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CVE-2024-21484 Marvin Attack of RSA and RSAOAEP decryption in jsrsasign

High 7.5 Published Updated

An attacker can decrypt RSA ciphertexts by exploiting a timing side-channel in the jsrsasign library, requiring access to many encrypted messages.

Exploited in the wild
Not known
Login needed
Not needed
Attackable
Over the internet
Victim action needed
Not needed
Fix
Available

What is CVE-2024-21484?

CVE-2024-21484 is a high-severity vulnerability in jsrsasign, published on 22 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-203

Which versions are affected by CVE-2024-21484?

2 open source packages ship an affected version, including jsrsasign. It affects 1 product.

PackageAffectedFixed in
jsrsasign npmAll versions11.0.0
jsrsasign npmAll versions11.0.0

Products include Kjur Jsrsasign.

How do I fix CVE-2024-21484?

Upgrade jsrsasign to 11.0.0 or later.

Is CVE-2024-21484 being exploited?

There is no known exploitation of CVE-2024-21484 in the wild and no public exploit code.

Sources

Also known as GHSA-rh63-9qcf-83gf.

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