Description

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.

INFO

Published Date :

Dec. 12, 2023, 5:15 p.m.

Last Modified :

Nov. 21, 2024, 8:35 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Public PoC/Exploit Available at Github

CVE-2023-4421 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2023-4421 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mozilla nss
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-4421.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2023-53/ Issue Tracking Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2023-53/ Issue Tracking Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

None

Java

Updated: 2 months, 1 week ago
1 stars 1 fork 1 watcher
Born at : Oct. 30, 2023, 4:58 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-4421 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-4421 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
    Added Reference https://www.mozilla.org/security/advisories/mfsa2023-53/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Dec. 20, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 No Types Assigned https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 Issue Tracking
    Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2023-53/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2023-53/ Issue Tracking, Vendor Advisory
    Added CWE NIST CWE-203
    Added CPE Configuration OR *cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:* versions up to (excluding) 3.6.1
  • CVE Received by [email protected]

    Dec. 12, 2023

    Action Type Old Value New Value
    Added Description 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.
    Added Reference Mozilla Corporation https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 [No types assigned]
    Added Reference Mozilla Corporation https://www.mozilla.org/security/advisories/mfsa2023-53/ [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-4421 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-4421 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.06 }} 0.01%

score

0.29602

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability