Bug 1922303 (CVE-2020-17525) - CVE-2020-17525 subversion: Remote unauthenticated denial of service in mod_authz_svn
Summary: CVE-2020-17525 subversion: Remote unauthenticated denial of service in mod_au...
Alias: CVE-2020-17525
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1923920 1923921 1923922 1923923 1923924 1923925 1923926 1923927 1923928 1927472
Blocks: 1922304
TreeView+ depends on / blocked
Reported: 2021-01-29 15:44 UTC by Pedro Sampaio
Modified: 2022-04-17 21:07 UTC (History)
4 users (show)

Fixed In Version: subversion 1.14.1, subversion 1.10.7
Doc Type: If docs needed, set a value
Doc Text:
A null-pointer-dereference flaw was found in mod_authz_svn of subversion. This flaw allows a remote, unauthenticated attacker to cause a denial of service in some server configurations. The highest threat from this vulnerability is to system availability.
Clone Of:
Last Closed: 2021-02-15 10:09:43 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:0507 0 None None None 2021-02-15 07:33:46 UTC
Red Hat Product Errata RHSA-2021:0508 0 None None None 2021-02-15 07:40:10 UTC
Red Hat Product Errata RHSA-2021:0509 0 None None None 2021-02-15 07:31:02 UTC

Description Pedro Sampaio 2021-01-29 15:44:46 UTC
A flaw was found in subversion versions 1.9.0 through 1.10.6 and 1.11.0 through 1.14.0. Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service.

Comment 1 Pedro Sampaio 2021-01-29 15:44:49 UTC

Name: the  Subversion security team
Upstream: Thomas Åkesson (simonsoft.se)

Comment 8 Huzaifa S. Sidhpurwala 2021-02-02 10:22:54 UTC

As per upstream "As a workaround, the use of in-repository authz rules files with the AuthzSVNReposRelativeAccessFile can be avoided by switching  to an alternative configuration which fetches an authz rules file from the server's filesystem, rather than from an SVN repository."

Comment 10 Guilherme de Almeida Suckevicz 2021-02-10 20:08:09 UTC
Created subversion tracking bugs for this issue:

Affects: fedora-all [bug 1927472]

Comment 11 Huzaifa S. Sidhpurwala 2021-02-11 03:35:16 UTC
External References:


Comment 12 errata-xmlrpc 2021-02-15 07:31:00 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:0509 https://access.redhat.com/errata/RHSA-2021:0509

Comment 13 errata-xmlrpc 2021-02-15 07:32:45 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:0507 https://access.redhat.com/errata/RHSA-2021:0507

Comment 14 errata-xmlrpc 2021-02-15 07:40:09 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0508 https://access.redhat.com/errata/RHSA-2021:0508

Comment 15 Product Security DevOps Team 2021-02-15 10:09:43 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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