CVE-2024-30171: Bouncy Castle Bouncy Castle Affected By Timing Vulnerability

MODERATE
Advisory Identifier: GHSA-v435-xc8x-wvr9
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CVSS 5.9
CWE-203
Published
Advisory Summary

CVE-2024-30171 is a MODERATE (CVSS 5.9) bouncy castle affected by timing vulnerability (CWE-203: Observable Discrepancy) affecting Bouncy Castle libraries in the Maven ecosystem. The issue involves bouncy castle affected by timing side-channel for rsa key exchange ("the marvin attack"). Remediation is available by upgrading affected packages to version 1.0.19, 1.78, 2.3.1.

CVE-2024-30171 at a Glance

CVE Identifier CVE-2024-30171
GHSA Identifier GHSA-v435-xc8x-wvr9
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-203: Observable Discrepancy
Affected Product Bouncy Castle
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2024-30171

To remediate this vulnerability, upgrade all affected Bouncy Castle dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.bouncycastle:bctls-fips fixed: 1.0.19 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bctls-fips</artifactId>
    <version>1.0.19</version>
</dependency>
org.bouncycastle:bcprov-jdk18on fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk18on</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bcprov-jdk15on fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bcprov-jdk15to18 fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15to18</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bcprov-jdk14 fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk14</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bctls-jdk18on fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bctls-jdk18on</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bctls-jdk14 fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bctls-jdk14</artifactId>
    <version>1.78</version>
</dependency>
org.bouncycastle:bctls-jdk15to18 fixed: 1.78 
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bctls-jdk15to18</artifactId>
    <version>1.78</version>
</dependency>
BouncyCastle fixed: Latest secure release 
Upgrade BouncyCastle to Latest secure release
BouncyCastle.Cryptography fixed: 2.3.1 
Upgrade BouncyCastle.Cryptography to 2.3.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.bouncycastle

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2024-30171, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.bouncycastle

Analyze the terminal output to locate any version of Bouncy Castle in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.19), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.bouncycastle command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-203: Observable Discrepancy, where the product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor. In Bouncy Castle, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in Bouncy Castle Java TLS API and JSSE Provider before 1.78. Timing-based leakage may occur in RSA based handshakes because of exception processing.

CVE-2024-30171 Affected Bouncy Castle Versions

10 component(s)
Fixed Versions:
1.0.191.782.3.1
Product / Package Ecosystem Affected Versions Fixed Version
org.bouncycastle:bctls-fips
maven/org.bouncycastle/bctls-fips
Maven
< 1.0.19
1.0.19
org.bouncycastle:bcprov-jdk18on
maven/org.bouncycastle/bcprov-jdk18on
Maven
< 1.78
1.78
org.bouncycastle:bcprov-jdk15on
maven/org.bouncycastle/bcprov-jdk15on
Maven
< 1.78
1.78
org.bouncycastle:bcprov-jdk15to18
maven/org.bouncycastle/bcprov-jdk15to18
Maven
< 1.78
1.78
org.bouncycastle:bcprov-jdk14
maven/org.bouncycastle/bcprov-jdk14
Maven
< 1.78
1.78
org.bouncycastle:bctls-jdk18on
maven/org.bouncycastle/bctls-jdk18on
Maven
< 1.78
1.78
org.bouncycastle:bctls-jdk14
maven/org.bouncycastle/bctls-jdk14
Maven
< 1.78
1.78
org.bouncycastle:bctls-jdk15to18
maven/org.bouncycastle/bctls-jdk15to18
Maven
< 1.78
1.78
BouncyCastle
nuget/BouncyCastle
NuGet
BouncyCastle.Cryptography
nuget/BouncyCastle.Cryptography
NuGet
< 2.3.1
2.3.1

References

NVD — CVE-2024-30171 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-30171
Security Fix Commit FIX COMMIT
https://github.com/bcgit/bc-csharp/commit/c984b8bfd8544dfc55dba91a02cbbbb9c580c217
Security Fix Commit FIX COMMIT
https://github.com/bcgit/bc-java/commit/d7d5e735abd64bf0f413f54fd9e495fc02400fb0
Security Fix Commit FIX COMMIT
https://github.com/bcgit/bc-java/commit/e0569dcb1dea9d421d84fc4c5c5688fe101afa2d
GitHub Advisory / Wiki ADVISORY
https://github.com/bcgit/bc-csharp/wiki/CVE%E2%80%902024%E2%80%9030171
GitHub Advisory / Wiki ADVISORY
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902024%E2%80%9030171
Bouncy Castle Security Information SECURITY
https://security.netapp.com/advisory/ntap-20240614-0008
Bouncy Castle Release RELEASE
https://www.bouncycastle.org/latest_releases.html

Frequently Asked Questions

What is CVE-2024-30171?
CVE-2024-30171 is a security vulnerability in Bouncy Castle involving Bouncy Castle affected by timing side-channel for RSA key exchange ("The Marvin Attack") under CWE-203: Observable Discrepancy.
Which Bouncy Castle versions are affected?
Affected versions include releases prior to 1.0.19, 1.78, 2.3.1 across affected packages: org.bouncycastle:bctls-fips, org.bouncycastle:bcprov-jdk18on, org.bouncycastle:bcprov-jdk15on, org.bouncycastle:bcprov-jdk15to18, org.bouncycastle:bcprov-jdk14, org.bouncycastle:bctls-jdk18on, org.bouncycastle:bctls-jdk14, org.bouncycastle:bctls-jdk15to18, BouncyCastle, BouncyCastle.Cryptography.
What version fixes CVE-2024-30171?
Upgrading to 1.0.19, 1.78, 2.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bctls-fips affected?
Yes, org.bouncycastle:bctls-fips is affected in releases prior to 1.0.19. Upgrade your dependency to 1.0.19 or later.
Is bcprov-jdk18on affected?
Yes, org.bouncycastle:bcprov-jdk18on is affected in releases prior to 1.78. Upgrade your dependency to 1.78 or later.
What is the CVSS score of CVE-2024-30171?
CVE-2024-30171 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2024-30171?
CVE-2024-30171 is classified under CWE-203: Observable Discrepancy (The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.).
How can I check Maven dependencies for CVE-2024-30171?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.bouncycastle'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-v435-xc8x-wvr9",
  "modified" : "2024-09-09T21:27:50Z",
  "published" : "2024-05-14T15:32:54Z",
  "aliases" : [ "CVE-2024-30171" ],
  "summary" : "Bouncy Castle affected by timing side-channel for RSA key exchange (\"The Marvin Attack\")",
  "details" : "An issue was discovered in Bouncy Castle Java TLS API and JSSE Provider before 1.78. Timing-based leakage may occur in RSA based handshakes because of exception processing.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bctls-fips"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.19"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bcprov-jdk18on"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bcprov-jdk15on"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bcprov-jdk15to18"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bcprov-jdk14"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bctls-jdk18on"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bctls-jdk14"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.bouncycastle:bctls-jdk15to18"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.78"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "BouncyCastle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 2.3.1"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "BouncyCastle.Cryptography"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-30171"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bcgit/bc-csharp/commit/c984b8bfd8544dfc55dba91a02cbbbb9c580c217"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bcgit/bc-java/commit/d7d5e735abd64bf0f413f54fd9e495fc02400fb0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bcgit/bc-java/commit/e0569dcb1dea9d421d84fc4c5c5688fe101afa2d"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bcgit/bc-csharp/wiki/CVE%E2%80%902024%E2%80%9030171"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902024%E2%80%9030171"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20240614-0008"
  }, {
    "type" : "WEB",
    "url" : "https://www.bouncycastle.org/latest_releases.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-203" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-14T20:22:03Z",
    "nvd_published_at" : "2024-05-14T15:21:52Z"
  }
}