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

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:P/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

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

Insight

Insight

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.

Affected Software

Affected Software

'puma' package(s) on Debian Linux.

Detection Method

Detection Method

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

Solution

Solution

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

Common Vulnerabilities and Exposures (CVE)