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Vulnerability of Subversion: external XML entity injection

Synthesis of the vulnerability 

An attacker can transmit malicious XML data to Subversion, in order to read a file, scan sites, or trigger a denial of service.
Vulnerable systems: Subversion, Debian, Fedora, openSUSE Leap, Oracle Fusion Middleware, Oracle Identity Management, Oracle OIT, WebLogic, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 29/11/2016.
Références of this weakness: cpuoct2020, CVE-2016-8734, DSA-3932-1, FEDORA-2017-c629f16f6c, openSUSE-SU-2016:3073-1, SUSE-SU-2017:2163-1, SUSE-SU-2017:2200-1, USN-3388-1, VIGILANCE-VUL-21236.

Description of the vulnerability 

XML data can contain external entities (DTD):
  <!ENTITY name SYSTEM "file">
  <!ENTITY name SYSTEM "http://server/file">
A program which reads these XML data can replace these entities by data coming from the indicated file. When the program uses XML data coming from an untrusted source, this behavior leads to:
 - content disclosure from files of the server
 - private web site scan
 - a denial of service by opening a blocking file
This feature must be disabled to process XML data coming from an untrusted source.

However, the Subversion parser allows external entities.

An attacker can therefore transmit malicious XML data to Subversion, in order to read a file, scan sites, or trigger a denial of service.
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This weakness alert impacts software or systems such as Subversion, Debian, Fedora, openSUSE Leap, Oracle Fusion Middleware, Oracle Identity Management, Oracle OIT, WebLogic, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability note is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this security bulletin.

Solutions for this threat 

Subversion: version 1.9.5.
The version 1.9.5 is fixed:
  http://subversion.apache.org/download/

Subversion: version 1.8.17.
The version 1.8.17 is fixed:
  http://subversion.apache.org/download/

Debian 8/9: new subversion packages.
New packages are available:
  Debian 8: subversion 1.8.10-6+deb8u5
  Debian 9: subversion 1.9.5-1+deb9u1

Fedora: new subversion packages.
New packages are available:
  Fedora 25: subversion 1.9.5-1.fc25

openSUSE Leap 42.2: new subversion packages.
New packages are available:
  openSUSE Leap 42.2: subversion 1.9.5-3.2

Oracle Fusion Middleware: CPU of October 2020.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=2694898.1

SUSE LE 11 SP4: new subversion packages.
New packages are available:
  SUSE LE 11 SP4: subversion 1.6.17-1.36.9.1

SUSE LE 12: new subversion packages.
New packages are available:
  SUSE LE 12 SP2: subversion 1.8.19-25.3.1
  SUSE LE 12 SP3: subversion 1.8.19-25.3.1

Ubuntu: new subversion packages.
New packages are available:
  Ubuntu 17.04: subversion 1.9.5-1ubuntu1.1
  Ubuntu 16.04 LTS: subversion 1.9.3-2ubuntu1.1
  Ubuntu 14.04 LTS: subversion 1.8.8-1ubuntu3.3
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