PT-2019-4672 · Ruby+8 · Ruby+8
Published
2019-07-27
·
Updated
2023-05-01
·
CVE-2019-16201
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Ruby versions 2.4.7 and earlier, 2.5.x through 2.5.6, 2.6.x through 2.6.4
Description
The issue is related to a regular expression Denial of Service caused by looping/backtracking in the WEBrick::HTTPAuth::DigestAuth class in Ruby. This can be exploited by a remote attacker to cause a denial of service if a victim exposes a WEBrick server that uses DigestAuth to the Internet or an untrusted network.
Recommendations
For Ruby versions 2.4.7 and earlier: update to a version later than 2.4.7 to resolve the issue.
For Ruby versions 2.5.x through 2.5.6: update to a version later than 2.5.6 to resolve the issue.
For Ruby versions 2.6.x through 2.6.4: update to a version later than 2.6.4 to resolve the issue.
As a temporary workaround, consider disabling the
WEBrick::HTTPAuth::DigestAuth class until a patch is available.Exploit
Fix
DoS
Improper Authentication
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Red Hat
Rocky Linux
Ruby
Suse
Ubuntu