Debian LTS: Security Advisory for puma (DLA-2398-1)

The remote host is missing an update for the 'puma' package(s) announced via the DLA-2398-1 advisory.

Several security vulnerabilities have been discovered in puma, highly concurrent HTTP server for Ruby/Rack applications. CVE-2020-11076 By using an invalid transfer-encoding header, an attacker could smuggle an HTTP response. CVE-2020-11077 client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client.

'puma' package(s) on Debian Linux.

Checks if a vulnerable package version is present on the target host.

For Debian 9 stretch, this problem has been fixed in version 3.6.0-1+deb9u1. We recommend that you upgrade your puma packages.