Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling.
This vulnerability is fixed in 1.4.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
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
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Capnproto Capnproto
cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:*
|
— |
1.4.0
|
References 5
https://capnproto.org/capnproto-c++-1.4.0.tar.gz
security-advisories@github.com
https://capnproto.org/capnproto-c++-win32-1.4.0.zip
security-advisories@github.com
https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829f…
security-advisories@github.com
https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43…
security-advisories@github.com
https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm
security-advisories@github.com