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FreeBSD: VID-4C52EC3C-86F3-11EA-B5B4-641C67A117D8 (CVE-2020-6817): py-bleach -- regular expression denial-of-service

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FreeBSD: VID-4C52EC3C-86F3-11EA-B5B4-641C67A117D8 (CVE-2020-6817): py-bleach -- regular expression denial-of-service

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
03/09/2019
Created
04/29/2020
Added
04/27/2020
Modified
03/02/2023

Description

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-4C52EC3C-86F3-11EA-B5B4-641C67A117D8:

Bleach developers reports:

bleach.clean behavior parsing style attributes could result in a

regular expression denial of service (ReDoS).

Calls to bleach.clean with an allowed tag with an allowed style

attribute are vulnerable to ReDoS. For example, bleach.clean(...,

attributes={'a': ['style']}).

Solution(s)

  • freebsd-upgrade-package-py27-bleach
  • freebsd-upgrade-package-py35-bleach
  • freebsd-upgrade-package-py36-bleach
  • freebsd-upgrade-package-py37-bleach
  • freebsd-upgrade-package-py38-bleach

References

  • CVE-2020-6817

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