Closed renovate[bot] closed 9 months ago
Kudos, SonarCloud Quality Gate passed!
0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells
No Coverage information
0.0% Duplication
Kudos, SonarCloud Quality Gate passed!
0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells
No Coverage information
0.0% Duplication
This PR contains the following updates:
4.1.93.Final
->4.1.94.Final
GitHub Vulnerability Alerts
CVE-2023-34462
Summary
The
SniHandler
can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using theSniHandler
to allocate 16MB of heap.Details
The
SniHandler
class is a handler that waits for the TLS handshake to configure aSslHandler
according to the indicated server name by theClientHello
record. For this matter it allocates aByteBuf
using the value defined in theClientHello
record.Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the
SslClientHelloHandler
1/ allocate a 16MB
ByteBuf
2/ not faildecode
methodin
buffer 3/ get out of the loop without an exceptionThe combination of this without the use of a timeout makes easy to connect to a TCP server and allocate 16MB of heap memory per connection.
Impact
If the user has no idle timeout handler configured it might be possible for a remote peer to send a client hello packet which lead the server to buffer up to 16MB of data per connection. This could lead to a OutOfMemoryError and so result in a DDOS.
Configuration
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