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Debian LTS: Security Advisory for ruby-websocket-extensions (DLA-2334-1)

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:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

1 year ago

Modified

Modified

1 year ago

Share

Summary

The remote host is missing an update for the 'ruby-websocket-extensions' package(s) announced via the DLA-2334-1 advisory.

Insight

Insight

It was discovered that there was a denial of service vulnerability in ruby-websocket-extensions, a library for managing long-lived HTTP 'WebSocket' connections. The parser took quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence. This could be abused by an attacker to conduct a Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload in the Sec-WebSocket-Extensions HTTP header.

Affected Software

Affected Software

'ruby-websocket-extensions' 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 0.1.2-1+deb9u1. We recommend that you upgrade your ruby-websocket-extensions packages.

Common Vulnerabilities and Exposures (CVE)

References

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multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

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