MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an authenticated user can bypass sandbox result validation and spoof tool execution results by exploiting Python frame introspection to read the wrapper's UUID from its bytecode constants, then writing a forged result directly to file descriptor 1 (bypassing stdout redirection). By calling sys.exit(0), the attacker terminates the wrapper before it prints the legitimate output, causing the MaxKB service to parse and trust the spoofed response as the genuine tool result.
This issue has been fixed in version 2.8.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/1Panel-dev/MaxKB/commit/38c4cfecd065293ede0437f6fa76cf011659…
security-advisories@github.com
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0
security-advisories@github.com
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f3c8-p474-xwfv
security-advisories@github.com