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2 vulnerabilities found for NSS by Mozilla

CVE-2023-4421 (GCVE-0-2023-4421)
Vulnerability from nvd
Published
2023-12-12 17:02
Modified
2025-11-04 19:25
Severity ?
CWE
  • Timing side-channel in PKCS#1 v1.5 decryption depadding code
Summary
The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS < 3.61.
References
Impacted products
Vendor Product Version
Mozilla NSS Version: unspecified   < 3.61
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2023-4421 (GCVE-0-2023-4421)
Vulnerability from cvelistv5
Published
2023-12-12 17:02
Modified
2025-11-04 19:25
Severity ?
CWE
  • Timing side-channel in PKCS#1 v1.5 decryption depadding code
Summary
The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS < 3.61.
References
Impacted products
Vendor Product Version
Mozilla NSS Version: unspecified   < 3.61
 Create a notification for this product.
Show details on NVD website

To clipboard 

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