[USN-3388-1] Subversion vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3388-1
August 11, 2017

subversion vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Subversion.

Software Description:
- subversion: Advanced version control system

Details:

Joern Schneeweisz discovered that Subversion did not properly handle
host names in 'svn+ssh://' URLs. A remote attacker could use this
to construct a subversion repository that when accessed could run
arbitrary code with the privileges of the user. (CVE-2017-9800)

Daniel Shahaf and James McCoy discovered that Subversion did not
properly verify realms when using Cyrus SASL authentication. A
remote attacker could use this to possibly bypass intended access
restrictions. This issue only affected Ubuntu 14.04 LTS and Ubuntu
16.04 LTS. (CVE-2016-2167)

Florian Weimer discovered that Subversion clients did not properly
restrict XML entity expansion when accessing http(s):// URLs. A remote
attacker could use this to cause a denial of service. This issue only
affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-8734)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
  libsvn1                         1.9.5-1ubuntu1.1
  subversion                      1.9.5-1ubuntu1.1

Ubuntu 16.04 LTS:
  libapache2-mod-svn              1.9.3-2ubuntu1.1
  libapache2-svn                  1.9.3-2ubuntu1.1
  libsvn1                         1.9.3-2ubuntu1.1
  subversion                      1.9.3-2ubuntu1.1

Ubuntu 14.04 LTS:
  libapache2-mod-svn              1.8.8-1ubuntu3.3
  libapache2-svn                  1.8.8-1ubuntu3.3
  libsvn1                         1.8.8-1ubuntu3.3
  subversion                      1.8.8-1ubuntu3.3

In general, a standard system update will make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3388-1
  CVE-2016-2167, CVE-2016-8734, CVE-2017-9800

Package Information:
  https://launchpad.net/ubuntu/+source/subversion/1.9.5-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/subversion/1.9.3-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/subversion/1.8.8-1ubuntu3.3

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