QID 982953

QID 982953: Java (maven) Security Update for org.http4s:blaze-core_2.13 (GHSA-xmw9-q7x9-j5qc)

Security update has been released for org.http4s:blaze-core_2.12,org.http4s:blaze-core_2.11,org.http4s:blaze-core_2.13 to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

All servers running blaze-core <= 0.14.14, including blaze-http and http4s-blaze-server users, are affected.

Blaze, accepts connections unconditionally on a dedicated thread pool. This has the net effect of amplifying degradation in services that are unable to handle their current request load, since incoming connections are still accepted and added to an unbounded queue. Each connection allocates a socket handle, which drains a scarce OS resource. This can also confound higher level circuit breakers which work based on detecting failed connections.

The vast majority of affected users are using it as part of http4s-blaze-server <= 0.21.16. http4s provides a mechanism for limiting open connections, but is enforced inside the Blaze accept loop, after the connection is accepted and the socket opened. Thus, the limit only prevents the number of connections which can be simultaneously processed, not the number of connections which can be held open.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

The issue is fixed in version 0.14.15 for `NIO1SocketServerGroup`. A `maxConnections` parameter is added, with a default value of 512. Concurrent connections beyond this limit are rejected. To run unbounded, which is not recommended, set a negative number.

The `NIO2SocketServerGroup` has no such setting and is now deprecated.Workaround:
* An Nginx side-car acting as a reverse proxy for the local http4s-blaze-server instance would be able to apply a connection limiting semantic before the sockets reach blaze-core. Nginxs connection bounding is both asynchronous and properly respects backpressure.
* A similar sidecar strategy is viable for other non-HTTP services running on blaze-core.
* http4s-ember-server is an alternative to http4s-blaze-server, but does not yet have HTTP/2 or web socket support. Its performance in terms of RPS is appreciably behind Blazes, and as the newest backend, has substantially less industrial uptake.
* http4s-jetty is an alternative to http4s-blaze-server, but does not yet have web socket support. Its performance in terms of requests per second is somewhat behind Blazes, and despite Jetty's industrial adoption, the http4s integration has substantially less industrial uptake.
* http4s-tomcat is an alternative to http4s-blaze-server, but does not yet have HTTP/2 web socket support. Its performance in terms of requests per second is somewhat behind Blazes, and despite Jetty's industrial adoption, the http4s integration has substantially less industrial uptake.

Vendor References

GHSA-xmw9-q7x9-j5qc - github.com/advisories/GHSA-xmw9-q7x9-j5qc

CVEs related to QID 982953

CVE-2021-21293 |

Software Advisories

Advisory ID	Software	Link
GHSA-xmw9-q7x9-j5qc	org.http4s:blaze-core_2.11	github.com/advisories/GHSA-xmw9-q7x9-j5qc
GHSA-xmw9-q7x9-j5qc	org.http4s:blaze-core_2.12	github.com/advisories/GHSA-xmw9-q7x9-j5qc
GHSA-xmw9-q7x9-j5qc	org.http4s:blaze-core_2.13	github.com/advisories/GHSA-xmw9-q7x9-j5qc

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