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Test ID:
Category:Debian Local Security Checks
Title:Debian LTS: Security Advisory for puma (DLA-2398-1)
Summary:The remote host is missing an update for the 'puma'; package(s) announced via the DLA-2398-1 advisory.
The remote host is missing an update for the 'puma'
package(s) announced via the DLA-2398-1 advisory.

Vulnerability Insight:
Several security vulnerabilities have been discovered in puma, highly
concurrent HTTP server for Ruby/Rack applications.


By using an invalid transfer-encoding header, an attacker could smuggle
an HTTP response.


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.

Affected Software/OS:
'puma' package(s) on Debian Linux.

For Debian 9 stretch, this problem has been fixed in version

We recommend that you upgrade your puma packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2020-11076
Common Vulnerability Exposure (CVE) ID: CVE-2020-11077
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