ghsa-7h5p-mmpp-hgmm

Vulnerability from github

Published

2024-09-04 17:38

Modified

2024-10-14 14:19

Severity ?

7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
5.1 (Medium) - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Summary

Nuclei Template Signature Verification Bypass

Details

Summary

A vulnerability has been identified in Nuclei's template signature verification system that could allow an attacker to bypass the signature check and possibly execute malicious code via custom code template.

Affected Component

The vulnerability is present in the template signature verification process, specifically in the signer package.

Description

The vulnerability stems from a discrepancy between how the signature verification process and the YAML parser handle newline characters, combined with the way multiple signatures are processed. This allows an attacker to inject malicious content into a template while maintaining a valid signature for the benign part of the template.

Affected Users

CLI Users: Those executing custom code templates from unverified sources. This includes templates authored by third parties or obtained from unverified repositories.
SDK Users: Developers integrating Nuclei into their platforms, particularly if they permit the execution of custom code templates by end-users.

[!NOTE] Code templates are disabled as default, users have to explicitly enable with -code option.

Proof of Concept

```yaml id: example-template info: name: Example Template

digest:

digest: \r

code:\r - engine:\r - sh\r - bash\r source: |\r id\r ```

Patches

The vulnerability is addressed in Nuclei v3.3.2 Users are strongly recommended to update to this version to mitigate the security risk.
Fix reference - https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a

Mitigation

Immediate Upgrade: The primary recommendation is to upgrade to Nuclei v3.2.0, where the vulnerability has been patched.
Avoid Unverified Templates: As an interim measure, users should refrain from using custom templates if unable to upgrade immediately. Only trusted, verified templates should be executed.

Workarounds

If you are unable to upgrade nuclei, disable running custom code templates as workaround.

Acknowledgments

We would like to thank Guy Goldenberg from Wiz who reported this to us via our security email, security@projectdiscovery.io.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/projectdiscovery/nuclei/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-43405"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-09-04T17:38:24Z",
    "nvd_published_at": "2024-09-04T16:15:06Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\nA vulnerability has been identified in Nuclei\u0027s template signature verification system that could allow an attacker to bypass the signature check and possibly execute malicious code via custom code template.\n\n## Affected Component\nThe vulnerability is present in the template signature verification process, specifically in the `signer` package.\n\n## Description\nThe vulnerability stems from a discrepancy between how the signature verification process and the YAML parser handle newline characters, combined with the way multiple signatures are processed. This allows an attacker to inject malicious content into a template while maintaining a valid signature for the benign part of the template.\n\n### Affected Users\n1. **CLI Users:** Those executing **custom code templates** from unverified sources. This includes templates authored by third parties or obtained from unverified repositories.\n2. **SDK Users:** Developers integrating Nuclei into their platforms, particularly if they permit the execution of **custom code templates** by end-users.\n\n\u003e [!NOTE]\n\u003e Code templates are disabled as default, users have to explicitly enable with `-code` option. \n\n## Proof of Concept\n\n```yaml\nid: example-template\ninfo:\n  name: Example Template\n# Other benign content...\n# digest: \u003cvalid_signature_for_benign_content\u003e\n# digest: \u003canother_signature\u003e\\r\ncode:\\r\n  - engine:\\r\n      - sh\\r\n      - bash\\r\n    source: |\\r\n      id\\r\n```\n### Patches\n1. The vulnerability is addressed in Nuclei v3.3.2 Users are strongly recommended to update to this version to mitigate the security risk.\n2. Fix reference - https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a\n\n### Mitigation\n- **Immediate Upgrade**: The primary recommendation is to upgrade to Nuclei v3.2.0, where the vulnerability has been patched.\n- **Avoid Unverified Templates**: As an interim measure, users should refrain from using custom templates if unable to upgrade immediately. Only trusted, [verified templates](https://github.com/projectdiscovery/nuclei-templates) should be executed.\n\n### Workarounds\nIf you are unable to upgrade nuclei, disable running custom code templates as workaround.\n\n## Acknowledgments\n\nWe would like to thank [Guy Goldenberg](https://github.com/GuyGoldenberg) from Wiz who reported this to us via our security email, [security@projectdiscovery.io](mailto:security@projectdiscovery.io).",
  "id": "GHSA-7h5p-mmpp-hgmm",
  "modified": "2024-10-14T14:19:19Z",
  "published": "2024-09-04T17:38:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-7h5p-mmpp-hgmm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43405"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/projectdiscovery/nuclei"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2024-3114"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Nuclei Template Signature Verification Bypass"
}

cve-2024-43405

Vulnerability from cvelistv5

Published

2024-09-04 15:36

Modified

2024-09-04 16:21

Severity ?

7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Summary

Nuclei is a vulnerability scanner powered by YAML based templates. Starting in version 3.0.0 and prior to version 3.3.2, a vulnerability in Nuclei's template signature verification system could allow an attacker to bypass the signature check and possibly execute malicious code via custom code template. The vulnerability is present in the template signature verification process, specifically in the `signer` package. The vulnerability stems from a discrepancy between how the signature verification process and the YAML parser handle newline characters, combined with the way multiple signatures are processed. This allows an attacker to inject malicious content into a template while maintaining a valid signature for the benign part of the template. CLI users are affected if they execute custom code templates from unverified sources. This includes templates authored by third parties or obtained from unverified repositories. SDK Users are affected if they are developers integrating Nuclei into their platforms, particularly if they permit the execution of custom code templates by end-users. The vulnerability is addressed in Nuclei v3.3.2. Users are strongly recommended to update to this version to mitigate the security risk. As an interim measure, users should refrain from using custom templates if unable to upgrade immediately. Only trusted, verified templates should be executed. Those who are unable to upgrade Nuclei should disable running custom code templates as a workaround.

References

▼	URL	Tags
	https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-7h5p-mmpp-hgmm	x_refsource_CONFIRM
	https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a	x_refsource_MISC

Impacted products

Vendor

Product

Version

▼

projectdiscovery

nuclei

Version: >= 3.0.0, < 3.3.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:projectdiscovery:nuclei:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "nuclei",
            "vendor": "projectdiscovery",
            "versions": [
              {
                "lessThan": "3.3.2",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-43405",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-04T16:21:03.366044Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-04T16:21:54.357Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nuclei",
          "vendor": "projectdiscovery",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.3.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nuclei is a vulnerability scanner powered by YAML based templates. Starting in version 3.0.0 and prior to version 3.3.2, a vulnerability in Nuclei\u0027s template signature verification system could allow an attacker to bypass the signature check and possibly execute malicious code via custom code template. The vulnerability is present in the template signature verification process, specifically in the `signer` package. The vulnerability stems from a discrepancy between how the signature verification process and the YAML parser handle newline characters, combined with the way multiple signatures are processed. This allows an attacker to inject malicious content into a template while maintaining a valid signature for the benign part of the template. CLI users are affected if they execute custom code templates from unverified sources. This includes templates authored by third parties or obtained from unverified repositories. SDK Users are affected if they are developers integrating Nuclei into their platforms, particularly if they permit the execution of custom code templates by end-users. The vulnerability is addressed in Nuclei v3.3.2. Users are strongly recommended to update to this version to mitigate the security risk. As an interim measure, users should refrain from using custom templates if unable to upgrade immediately. Only trusted, verified templates should be executed. Those who are unable to upgrade Nuclei should disable running custom code templates as a workaround."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-09-04T15:36:23.277Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-7h5p-mmpp-hgmm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-7h5p-mmpp-hgmm"
        },
        {
          "name": "https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/projectdiscovery/nuclei/commit/0da993afe6d41b4b1b814e8fad23a2acba13c60a"
        }
      ],
      "source": {
        "advisory": "GHSA-7h5p-mmpp-hgmm",
        "discovery": "UNKNOWN"
      },
      "title": "Nuclei Template Signature Verification Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-43405",
    "datePublished": "2024-09-04T15:36:23.277Z",
    "dateReserved": "2024-08-12T18:02:04.966Z",
    "dateUpdated": "2024-09-04T16:21:54.357Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

ghsa-7h5p-mmpp-hgmm

Vulnerability from github

Summary

Affected Component

Description

Affected Users

Proof of Concept

Other benign content...

digest:

digest: \r

Patches

Mitigation

Workarounds

Acknowledgments

cve-2024-43405

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature