9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-23535

CVE-2022-23535: 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

(GitHub Advisory)

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CVE-2022-23535

CVE-2022-23535:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
LiteDB	nuget	< 5.0.13	5.0.13

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from how BsonMapper handles '_type' during deserialization. The commit 4382ff4 adds two critical checks: 1) IsAssignableFrom validation to ensure type compatibility, and 2) explicit blocking of System.Diagnostics.Process. The original code (shown in the diff) lacked these checks, making the Deserialize method vulnerable to type confusion attacks. The function's responsibility to resolve and validate types based on untrusted '_type' values directly matches the described exploit scenario where malicious types could be loaded via user-controlled JSON.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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9.8

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2022-23535: LiteDB may deserialize bad JSON on object type using _type

Impact

Patches

Workarounds

References

CVE-2022-23535:

9.8

-

Basic Information

Basic Information

Is this CVE running in your environment?

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

Vulnerability IntelligenceMiggo AI

Unlock WAF rules for this CVE

WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

Technical Details

9.8

9.8

CVE-2022-23535: LiteDB may deserialize bad JSON on object type using _type

Impact

Patches

Workarounds

References

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI