CVE-2023-4421

Published: Dic 12, 2023 Last Modified: Nov 04, 2025
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0024
Percentile
0,5th
Updated

EPSS Score Trend (Last 90 Days)

203

Observable Discrepancy

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Access Control
Potential Impacts:
Read Application Data Bypass Protection Mechanism
Applicable Platforms
All platforms may be affected
View CWE Details
Application

Nss by Mozilla

Product Information
Vendor Mozilla
Product Nss
Version Range Affected
To 3.6.1 (exclusive)
cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
https://lists.debian.org/debian-lts-announce/2023/10/msg000…
https://lists.debian.org/debian-lts-announce/2023/10/msg00039.html
https://www.mozilla.org/security/advisories/mfsa2023-53/
https://www.mozilla.org/security/advisories/mfsa2023-53/
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
https://www.mozilla.org/security/advisories/mfsa2023-53/
https://www.mozilla.org/security/advisories/mfsa2023-53/