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Observable Discrepancy Affecting jsrsasign package, versions <11.0.0

0.0
high

Snyk CVSS

    Attack Complexity High
    Scope Changed
    Confidentiality High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.08% (35th percentile)
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NVD
5.9 medium

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  • Snyk ID SNYK-JS-JSRSASIGN-6070731
  • published 21 Jan 2024
  • disclosed 21 Nov 2023
  • credit Hubert Kario
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Introduced: 21 Nov 2023

CVE-2024-21484 Open this link in a new tab
CWE-203 Open this link in a new tab
First added by Snyk

How to fix?

Upgrade jsrsasign to version 11.0.0 or higher.

Overview

jsrsasign is a free pure JavaScript cryptographic library.

Affected versions of this package are vulnerable to Observable Discrepancy via the RSA PKCS#1.5 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.