Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.
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
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Netty Netty
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
|
4.1.133
|
4.1.138
|
|
Netty Netty
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
|
4.2.13
|
4.2.18
|
References 8
https://github.com/netty/netty
disclosure@vulncheck.com
https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/jav…
disclosure@vulncheck.com
https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c
disclosure@vulncheck.com
https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585
disclosure@vulncheck.com
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final
disclosure@vulncheck.com
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final
disclosure@vulncheck.com
https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-…
disclosure@vulncheck.com