github - ghsa-4hh3-vj32-gr6j

GHSA-4HH3-VJ32-GR6J

Vulnerability from github – Published: 2024-08-19 17:29 – Updated: 2024-08-19 17:29

Summary

Mobile Security Framework (MobSF) has a Zip Slip Vulnerability in .a Static Library Files

Details

Summary

Upon reviewing the MobSF source code, I identified a flaw in the Static Libraries analysis section. Specifically, during the extraction of .a extension files, the measure intended to prevent Zip Slip attacks is improperly implemented.

Since the implemented measure can be bypassed, the vulnerability allows an attacker to extract files to any desired location within the server running MobSF.

Details

Upon examining lines 183-192 of the mobsf/StaticAnalyzer/views/common/shared_func.py file, it is observed that there is a mitigation against Zip Slip attacks implemented as a.decode('utf-8', 'ignore').replace('../', '').replace('..\\', ''). However, this measure can be bypassed using sequences like ....//....//....//. Since the replace operation is not recursive, this sequence is transformed into ../../../ after the replace operation, allowing files to be written to upper directories.

For the proof of concept, I created an .a archive file that renders MobSF unusable by writing an empty file with the same name over the database located at /home/mobsf/.MobSF/db.sqlite3.

poc a_1

I am including the binary used for the POC named poc.VULN. To test it, you need to rename this binary to poc.a.

Warning: As soon as you scan this file with MobSF, the database will be deleted, rendering MobSF unusable.

PoC Binary File (poc.VULN)

PoC

https://github.com/user-attachments/assets/3225ccb0-cb00-47a5-8305-37a40ca1ae7f

Impact

When a malicious .a file is scanned with MobSF, a critical vulnerability is present as it allows files to be extracted to any location on the server where MobSF is running. In this POC, I deleted the database, but it is also possible to achieve RCE by overwriting binaries of certain tools or by overwriting the /etc/passwd file.

Severity ?

8.0 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.0.6"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "mobsf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-43399"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-23"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-08-19T17:29:52Z",
    "nvd_published_at": "2024-08-19T15:15:09Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nUpon reviewing the MobSF source code, I identified a flaw in the Static Libraries analysis section. Specifically, during the extraction of .a extension files, the measure intended to prevent Zip Slip attacks is improperly implemented.\n\nSince the implemented measure can be bypassed, the vulnerability allows an attacker to extract files to any desired location within the server running MobSF.\n\n### Details\n\nUpon examining lines 183-192 of the `mobsf/StaticAnalyzer/views/common/shared_func.py` file, it is observed that there is a mitigation against Zip Slip attacks implemented as `a.decode(\u0027utf-8\u0027, \u0027ignore\u0027).replace(\u0027../\u0027, \u0027\u0027).replace(\u0027..\\\\\u0027, \u0027\u0027)`. However, this measure can be bypassed using sequences like `....//....//....//`. Since the replace operation is not recursive, this sequence is transformed into `../../../` after the replace operation, allowing files to be written to upper directories.\n\n\u003cimg width=\"448\" alt=\"image\" src=\"https://github.com/user-attachments/assets/fadf4bcc-1a92-4655-b66a-5349278ad9c5\"\u003e\n\n\nFor the proof of concept, I created an .a archive file that renders MobSF unusable by writing an empty file with the same name over the database located at `/home/mobsf/.MobSF/db.sqlite3`.\n\n\u003cimg width=\"300\" alt=\"poc a_1\" src=\"https://github.com/user-attachments/assets/54acf101-3931-401f-9970-a0934265eecb\"\u003e\n\n\nI am including the binary used for the POC named `poc.VULN`. To test it, you need to rename this binary to `poc.a`.\n\n **Warning:** As soon as you scan this file with MobSF, the database will be deleted, rendering MobSF unusable.\n\nPoC Binary File ([poc.VULN](https://drive.google.com/file/d/1K2eHYIZ1hUbs-Vi5zhKAKecnd0nDB8lO/view?usp=share_link))\n\n### PoC\n\n\nhttps://github.com/user-attachments/assets/3225ccb0-cb00-47a5-8305-37a40ca1ae7f\n\n\n\n### Impact\n\nWhen a malicious .a file is scanned with MobSF, a critical vulnerability is present as it allows files to be extracted to any location on the server where MobSF is running. In this POC, I deleted the database, but it is also possible to achieve RCE by overwriting binaries of certain tools or by overwriting the /etc/passwd file.\n",
  "id": "GHSA-4hh3-vj32-gr6j",
  "modified": "2024-08-19T17:29:52Z",
  "published": "2024-08-19T17:29:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-4hh3-vj32-gr6j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43399"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/cc625fe8430f3437a473e82aa2966d100a4dc883"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MobSF/Mobile-Security-Framework-MobSF"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Mobile Security Framework (MobSF) has a Zip Slip Vulnerability in .a Static Library Files"
}

CVE-2024-43399 (GCVE-0-2024-43399)

Vulnerability from cvelistv5 – Published: 2024-08-19 14:44 – Updated: 2024-08-19 15:27

Summary

Mobile Security Framework (MobSF) is a pen-testing, malware analysis and security assessment framework capable of performing static and dynamic analysis. Before 4.0.7, there is a flaw in the Static Libraries analysis section. Specifically, during the extraction of .a extension files, the measure intended to prevent Zip Slip attacks is improperly implemented. Since the implemented measure can be bypassed, the vulnerability allows an attacker to extract files to any desired location within the server running MobSF. This vulnerability is fixed in 4.0.7.

Severity ?

8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-23 - Relative Path Traversal

Assigner

GitHub_M

References

URL

Tags

	https://github.com/MobSF/Mobile-Security-Framewor…	x_refsource_CONFIRM
	https://github.com/MobSF/Mobile-Security-Framewor…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	MobSF	Mobile-Security-Framework-MobSF	Affected: < 4.0.7

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:mobsf:mobile_security_framework:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "mobile_security_framework",
            "vendor": "mobsf",
            "versions": [
              {
                "lessThan": "4.0.7",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-43399",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-08-19T15:23:58.694432Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-08-19T15:27:04.688Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Mobile-Security-Framework-MobSF",
          "vendor": "MobSF",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.0.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mobile Security Framework (MobSF) is a pen-testing, malware analysis and security assessment framework capable of performing static and dynamic analysis. Before 4.0.7, there is a flaw in the Static Libraries analysis section. Specifically, during the extraction of .a extension files, the measure intended to prevent Zip Slip attacks is improperly implemented. Since the implemented measure can be bypassed, the vulnerability allows an attacker to extract files to any desired location within the server running MobSF. This vulnerability is fixed in 4.0.7."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-23",
              "description": "CWE-23: Relative Path Traversal",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-08-19T14:44:47.180Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-4hh3-vj32-gr6j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/security/advisories/GHSA-4hh3-vj32-gr6j"
        },
        {
          "name": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/cc625fe8430f3437a473e82aa2966d100a4dc883",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/MobSF/Mobile-Security-Framework-MobSF/commit/cc625fe8430f3437a473e82aa2966d100a4dc883"
        }
      ],
      "source": {
        "advisory": "GHSA-4hh3-vj32-gr6j",
        "discovery": "UNKNOWN"
      },
      "title": "Mobile Security Framework (MobSF) has a Zip Slip Vulnerability in .a Static Library Files"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-43399",
    "datePublished": "2024-08-19T14:44:47.180Z",
    "dateReserved": "2024-08-12T18:02:04.965Z",
    "dateUpdated": "2024-08-19T15:27:04.688Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-4HH3-VJ32-GR6J

Summary

Details

PoC

Impact

CVE-2024-43399 (GCVE-0-2024-43399)

Tags

Sightings

Nomenclature