Bug 1733073 (CVE-2019-0203) - CVE-2019-0203 subversion: NULL pointer dereference in svnserve leading to an unauthenticated remote DoS
Summary: CVE-2019-0203 subversion: NULL pointer dereference in svnserve leading to an ...
Alias: CVE-2019-0203
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1733439 1733440 1733441 1733442 1733443 1735579
Blocks: 1733096
TreeView+ depends on / blocked
Reported: 2019-07-25 07:25 UTC by msiddiqu
Modified: 2021-02-16 21:36 UTC (History)
5 users (show)

Fixed In Version: subversion 1.12.2, subversion 1.10.6, subversion 1.9.12
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in subversion. A remote, unauthenticated user can cause a null-pointer-dereference in svnserve by sending a certain sequences of protocol commands to the server. This results in a denial of service in some server configurations, specifically when anonymous access is enabled. The highest threat from this vulnerability is to system availability.
Clone Of:
Last Closed: 2019-08-15 20:47:01 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2512 0 None None None 2019-08-15 17:48:35 UTC

Description msiddiqu 2019-07-25 07:25:06 UTC
Subversion's svnserve server process may exit when a client sends certain sequences of protocol commands. This can lead to disruption for users of the server. A null-pointer-dereference in svnserve results in a remote unauthenticated Denial-of-Service in some server configurations. The vulnerability can be triggered by an unauthenticated user if the server is configured with anonymous access enabled.

The problem originates in opening a new connection to svnserve. On failure to find the specified repository or to be authorized to access it, svnserve logs and reports the error, but also keeps the connection open despite its incomplete initialization. If the client sends any further command on the same connection, then a null-pointer dereference occurs in svnserve.

Exploitation results in denial of service by crashing an svnserve process. The impact of this differs depending on how svnserve is launched, including the different run modes selected by options such as "svnserve -d", "svnserve -T -d", "svnserve -t", and "svnserve -i".

Comment 9 Marian Rehak 2019-08-01 06:17:16 UTC
Created subversion tracking bugs for this issue:

Affects: fedora-all [bug 1735579]

Comment 13 Huzaifa S. Sidhpurwala 2019-08-06 03:52:17 UTC
External References:


Comment 19 errata-xmlrpc 2019-08-15 17:48:34 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:2512 https://access.redhat.com/errata/RHSA-2019:2512

Comment 20 Product Security DevOps Team 2019-08-15 20:47:01 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


Comment 22 msiddiqu 2019-08-16 05:50:59 UTC

Name: the Subversion project (Apache Software Foundation)
Upstream: Tomas Bortoli

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