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Security Advisories: GSA_kwCzR0hTQS1jNmZnLTk5cHItMjVtOc0g_g

Uncapped length of skin data fields submitted by players

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_Strings. 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:

Permalink: https://github.com/advisories/GHSA-c6fg-99pr-25m9
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1jNmZnLTk5cHItMjVtOc0g_g
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: over 1 year ago


CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Identifiers: GHSA-c6fg-99pr-25m9
References: Repository: https://github.com/pmmp/PocketMine-MP
Blast Radius: 15.6

Affected Packages

packagist:pocketmine/pocketmine-mp
Dependent packages: 59
Dependent repositories: 120
Downloads: 59,095 total
Affected Version Ranges: >= 4.0.0, < 4.0.5, < 3.26.5
Fixed in: 4.0.5, 3.26.5
All affected versions: 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10, 3.0.11, 3.0.12, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.5.4, 3.5.5, 3.5.6, 3.5.7, 3.5.8, 3.5.9, 3.5.10, 3.5.11, 3.5.12, 3.5.13, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.6.4, 3.6.5, 3.6.6, 3.7.0, 3.7.1, 3.7.2, 3.7.3, 3.8.0, 3.8.1, 3.8.2, 3.8.3, 3.8.4, 3.8.5, 3.8.6, 3.8.7, 3.9.0, 3.9.1, 3.9.2, 3.9.3, 3.9.4, 3.9.5, 3.9.6, 3.9.7, 3.9.8, 3.10.0, 3.10.1, 3.11.0, 3.11.1, 3.11.2, 3.11.3, 3.11.4, 3.11.5, 3.11.6, 3.11.7, 3.12.0, 3.12.1, 3.12.2, 3.12.3, 3.12.4, 3.12.5, 3.12.6, 3.13.0, 3.13.1, 3.14.0, 3.14.1, 3.14.2, 3.14.3, 3.15.0, 3.15.1, 3.15.2, 3.15.3, 3.15.4, 3.16.0, 3.16.1, 3.17.0, 3.17.1, 3.17.2, 3.17.3, 3.17.4, 3.17.5, 3.17.6, 3.17.7, 3.18.0, 3.18.1, 3.18.2, 3.19.0, 3.19.1, 3.19.2, 3.19.3, 3.20.0, 3.21.0, 3.21.1, 3.22.0, 3.22.1, 3.22.2, 3.22.3, 3.22.4, 3.22.5, 3.23.0, 3.23.1, 3.24.0, 3.25.0, 3.25.1, 3.25.2, 3.25.3, 3.25.4, 3.25.5, 3.25.6, 3.26.0, 3.26.1, 3.26.2, 3.26.3, 3.26.4, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4
All unaffected versions: 3.26.5, 3.27.0, 3.28.0, 4.0.5, 4.0.6, 4.0.7, 4.0.8, 4.0.9, 4.1.0, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.2.6, 4.2.7, 4.2.8, 4.2.9, 4.2.10, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 4.4.0, 4.4.1, 4.4.2, 4.5.0, 4.5.1, 4.5.2, 4.6.0, 4.6.1, 4.6.2, 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.8.0, 4.8.1, 4.9.0, 4.9.1, 4.10.0, 4.10.1, 4.10.2, 4.11.0, 4.12.0, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 4.12.5, 4.12.6, 4.12.7, 4.12.8, 4.12.9, 4.12.10, 4.12.11, 4.13.0, 4.14.0, 4.14.1, 4.15.0, 4.15.1, 4.15.2, 4.15.3, 4.16.0, 4.17.0, 4.17.1, 4.17.2, 4.18.0, 4.18.1, 4.18.2, 4.18.3, 4.18.4, 4.19.0, 4.19.1, 4.19.2, 4.19.3, 4.20.0, 4.20.1, 4.20.2, 4.20.3, 4.20.4, 4.20.5, 4.21.0, 4.21.1, 4.22.0, 4.22.1, 4.22.2, 4.22.3, 4.23.0, 4.23.1, 4.23.2, 4.23.3, 4.23.4, 4.23.5, 4.23.6, 4.24.0, 4.25.0, 4.26.0, 5.0.0, 5.0.1, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.2.0, 5.2.1, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.3.4, 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.5.0, 5.6.0, 5.6.1, 5.7.0, 5.7.1, 5.8.0, 5.8.1, 5.8.2, 5.9.0, 5.10.0, 5.11.0, 5.11.1, 5.11.2, 5.12.0, 5.12.1, 5.13.0, 5.14.0, 5.14.1, 5.15.0, 5.16.0, 5.17.0, 5.17.1, 5.18.0, 5.18.1