GHSA-6mjq-h674-j845
Suggest an improvement- Source
- https://github.com/advisories/GHSA-6mjq-h674-j845
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-6mjq-h674-j845/GHSA-6mjq-h674-j845.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-6mjq-h674-j845
- Aliases
- Related
- Published
- 2023-06-20T16:33:22Z
- Modified
- 2024-06-25T02:35:08.283799Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- netty-handler SniHandler 16MB allocation
- Details
-
Summary
The
SniHandlercan 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 theSniHandlerto allocate 16MB of heap.Details
The
SniHandlerclass is a handler that waits for the TLS handshake to configure aSslHandleraccording to the indicated server name by theClientHellorecord. For this matter it allocates aByteBufusing the value defined in theClientHellorecord.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
SslClientHelloHandler1/ allocate a 16MB
ByteBuf2/ not faildecodemethodinbuffer 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.
- References
-
- https://github.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845
- https://nvd.nist.gov/vuln/detail/CVE-2023-34462
- https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32
- https://github.com/netty/netty
- https://security.netapp.com/advisory/ntap-20230803-0001
- https://security.netapp.com/advisory/ntap-20240621-0007
- https://www.debian.org/security/2023/dsa-5558
Affected packages
Maven / io.netty:netty-handler
Package
- Name
- io.netty:netty-handler
- View open source insights on deps.dev
- Purl
- pkg:maven/io.netty/netty-handler
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed4.1.94.Final