LMCache through 0.5.5 contains a missing authentication vulnerability in the multiprocess coordinator that allows remote unauthenticated attackers to access its HTTP fleet control API listening on all interfaces by default. Attackers can register or deregister instances via /instances, overwrite quotas via /quota endpoints, inject events via /events, and enumerate /directory/keys to disrupt caching and disclose placement metadata.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/LMCache/LMCache
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/app.py…
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/config…
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/issues/5508
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/lmcache-through-0.5.5-missing-authenticati…
disclosure@vulncheck.com