GHSA-c6fg-99pr-25m9: Pocketmine/pocketmine mp Uncapped Length Of Skin Data Vulnerability

HIGH
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CVSS 7.5
Published
Advisory Summary

GHSA-c6fg-99pr-25m9 is a HIGH (CVSS 7.5) uncapped length of skin data vulnerability (General Security Weakness) affecting Pocketmine/pocketmine mp libraries in the Packagist ecosystem. The issue involves uncapped length of skin data fields submitted by players. Remediation is available by upgrading affected packages to version 3.26.5, 4.0.5.

GHSA-c6fg-99pr-25m9 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-c6fg-99pr-25m9
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification General Security Weakness
Affected Product Pocketmine/pocketmine mp
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix GHSA-c6fg-99pr-25m9

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

pocketmine/pocketmine-mp fixed: 3.26.5 
Upgrade pocketmine/pocketmine-mp to 3.26.5
pocketmine/pocketmine-mp fixed: 4.0.5 
Upgrade pocketmine/pocketmine-mp to 4.0.5
Verify Direct and Transitive Dependencies

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

inspect dependencies for pocketmine/pocketmine-mp

How to Check if You Are Affected

To determine whether your application is affected by GHSA-c6fg-99pr-25m9, inspect your project dependencies for Pocketmine/pocketmine mp:

inspect dependencies for pocketmine/pocketmine-mp

Analyze the terminal output to locate any version of Pocketmine/pocketmine mp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.26.5), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Pocketmine/pocketmine mp, 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

### Impact Some skin data fields (e.g. skinID, geometryName) are not capped in length. These fields are typically saved in the NBT data of a player when the player quits the server, or during an autosave. This is problematic due to the 32767 byte limit on `TAG_String`s. If any of these fields exceeds 32767 bytes, an exception will be thrown during data saving, which will cause the server to crash. Other fields (such as skinGeometryData) are also uncapped, but those have a much larger 2 GB length limit, so this is not a concern for those, particularly considering the decompressed packet size limit of 2 MB. ### Patches PM3: 958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb PM4: 6492cac5c10f9fa8443ceddd2191a7b65b73f601 ### Workarounds A plugin may check player skins during `PlayerLoginEvent` and `PlayerSkinChangeEvent` and ensure that the offending fields are not larger than 32767 bytes. ### For more information If you have any questions or comments about this advisory: * Email us at [team@pmmp.io](mailto:team@pmmp.io)

GHSA-c6fg-99pr-25m9 Affected Pocketmine/pocketmine mp Versions

2 component(s)
Fixed Versions:
3.26.54.0.5
Product / Package Ecosystem Affected Versions Fixed Version
pocketmine/pocketmine-mp
 Packagist
< 3.26.5
3.26.5
pocketmine/pocketmine-mp
 Packagist
≥ 4.0.0
< 4.0.5
4.0.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-c6fg-99pr-25m9
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/6492cac5c10f9fa8443ceddd2191a7b65b73f601
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb
Pocketmine/pocketmine mp Source Repository REPOSITORY
https://github.com/pmmp/PocketMine-MP

Frequently Asked Questions

What is GHSA-c6fg-99pr-25m9?
GHSA-c6fg-99pr-25m9 is a security vulnerability in Pocketmine/pocketmine mp involving Uncapped length of skin data fields submitted by players under General Security Weakness.
Which Pocketmine/pocketmine mp versions are affected?
Affected versions include releases prior to 3.26.5, 4.0.5 across affected packages: pocketmine/pocketmine-mp.
What version fixes GHSA-c6fg-99pr-25m9?
Upgrading to 3.26.5, 4.0.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pocketmine/pocketmine-mp affected?
Yes, pocketmine/pocketmine-mp is affected in releases prior to 3.26.5, 4.0.5. Upgrade your dependency to 3.26.5, 4.0.5 or later.
What is the CVSS score of GHSA-c6fg-99pr-25m9?
GHSA-c6fg-99pr-25m9 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-c6fg-99pr-25m9?
GHSA-c6fg-99pr-25m9 is classified under General Security Weakness.
How can I check Packagist dependencies for GHSA-c6fg-99pr-25m9?
Run the dependency tree command: 'inspect dependencies for pocketmine/pocketmine-mp'. 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-c6fg-99pr-25m9",
  "modified" : "2022-01-06T19:47:00Z",
  "published" : "2022-01-06T23:53:58Z",
  "aliases" : [ ],
  "summary" : "Uncapped length of skin data fields submitted by players",
  "details" : "### Impact\nSome skin data fields (e.g. skinID, geometryName) are not capped in length. These fields are typically saved in the NBT data of a player when the player quits the server, or during an autosave.\n\nThis is problematic due to the 32767 byte limit on `TAG_String`s. If any of these fields exceeds 32767 bytes, an exception will be thrown during data saving, which will cause the server to crash.\n\nOther fields (such as skinGeometryData) are also uncapped, but those have a much larger 2 GB length limit, so this is not a concern for those, particularly considering the decompressed packet size limit of 2 MB.\n\n### Patches\nPM3: 958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb\nPM4: 6492cac5c10f9fa8443ceddd2191a7b65b73f601\n\n### Workarounds\nA plugin may check player skins during `PlayerLoginEvent` and `PlayerSkinChangeEvent` and ensure that the offending fields are not larger than 32767 bytes.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [team@pmmp.io](mailto:team@pmmp.io)\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "pocketmine/pocketmine-mp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.26.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "pocketmine/pocketmine-mp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-c6fg-99pr-25m9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/6492cac5c10f9fa8443ceddd2191a7b65b73f601"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pmmp/PocketMine-MP"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-06T19:47:00Z",
    "nvd_published_at" : null
  }
}