Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0zeDQ5LWc2cmMtYzI4NM4AAxzV

LiteDB may deserialize bad JSON on object type using _type

Impact

LiteDB use a special field in JSON documents to cast diferent types from BsonDocument do POCO classes. When instance of an object are not the same of class, BsonMapper use a special field _type string info with full class name with assembly to be loaded and fit in your model.
If your end-user can send to your app a plain JSON string, deserialization can load an unsafe object to fit in your model.

Patches

Version >= 5.0.13 add some basic fixes to avoid this, but is not 100% guaranteed when using Object type
Next major version will contains a allow-list to select what king of Assembly can be loaded

Workarounds

• Avoid users send to your app a JSON string to be direct insert/update into database
• Avoid use classes with Object type - try use an interface when possible

If your app send a plain JSON string to be insert/update into database, prefer this:

// Bad
public class Customer {
    public int Id { get; set; }
    public string Name { get; set; }
    public Object AnyData { get; set; } // <= Avoid use `Object` base type
}

// Good
public class Customer {
    public int Id { get; set; }
    public string Name { get; set; }
    public IDictionary<string, string> AnyData { get; set; } // Will accept only key/value strings
}

References

See this workaround fix on this commit:

https://github.com/mbdavid/LiteDB/commit/4382ff4dd0dd8b8b16a4e37dfd29727c5f70f93f

Permalink: https://github.com/advisories/GHSA-3x49-g6rc-c284
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0zeDQ5LWc2cmMtYzI4NM4AAxzV
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 1 year ago
Updated: over 1 year ago

CVSS Score: 9.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-3x49-g6rc-c284, CVE-2022-23535
References:

• https://github.com/mbdavid/LiteDB/security/advisories/GHSA-3x49-g6rc-c284
• https://github.com/mbdavid/LiteDB/commit/4382ff4dd0dd8b8b16a4e37dfd29727c5f70f93f
• https://github.com/mbdavid/LiteDB/commit/d72c6774e6a13de2cfcd7d477d3575efeb75c8f2
• https://github.com/mbdavid/LiteDB/releases/tag/v5.0.13
• https://nvd.nist.gov/vuln/detail/CVE-2022-23535
• https://github.com/advisories/GHSA-3x49-g6rc-c284

Repository: https://github.com/mbdavid/LiteDB
Blast Radius: 1.0

Affected Packages