CVE-2015-2316

The utils.html.strip_tags function in Django 1.6.x before 1.6.11, 1.7.x before 1.7.7, and 1.8.x before 1.8c1, when using certain versions of Python, allows remote attackers to cause a denial of service (infinite loop) by increasing the length of the input string.

Updated python-django and python-django14 packages fix security vulnerabilities:

The ModelAdmin.readonly_fields attribute in the Django admin allows displaying model fields and model attributes. While the former were correctly escaped, the latter were not. Thus untrusted content could be injected into the admin, presenting an exploitation vector for XSS attacks (CVE-2015-2241).

Django relies on user input in some cases to redirect the user to an "on success" URL. The security checks for these redirects accepted URLs with leading control characters and so considered URLs like \x08javascript:... safe. This issue doesn't affect Django currently, however, if a developer relies on is_safe_url() to provide safe redirect targets and puts such a URL into a link, they could suffer from an XSS attack as some browsers such as Google Chrome ignore control characters at the start of a URL in an anchor href (CVE-2015-2317).

Note that the CVE-2015-2241 issue does not affect python-django14 directly, but client code using it may be affected. Please see the March 9th upstream advisory for more information on this.

The utils.html.strip_tags function in Django 1.6.x before 1.6.11, 1.7.x before 1.7.7, and 1.8.x before 1.8c1, when using certain versions of Python, allows remote attackers to cause a denial of service (infinite loop) by increasing the length of the input string.

python-django was updated to 1.5.10 fixing bugs and security issues:

* Prevented reverse() from generating URLs pointing to other hosts to
  prevent phishing attacks. (bnc#893087, CVE-2014-0480)
* Removed O(n) algorithm when uploading duplicate file names to fix
  file upload denial of service. (bnc#893088, CVE-2014-0481)
* Modified RemoteUserMiddleware to logout on REMOTE_USE change to
  prevent session hijacking. (bnc#893089, CVE-2014-0482)
* Prevented data leakage in contrib.admin via query string
  manipulation. (bnc#893090, CVE-2014-0483)

Security Issues:

* CVE-2014-0480
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0480>
* CVE-2014-0481
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0481>
* CVE-2014-0482
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0482>
* CVE-2014-0483
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0483>

python-Django has been updated to fix two vulnerabilities:

* URLs starting with control characters could have allowed XSS
  (cross-site-scripting) attacks via user-supplied redirect URLs
  (CVE-2015-2317)
* An infinite loop possibility could be triggered in the strip_tags()
  function, which allowed denial of service attacks (CVE-2015-2316)

Security Issues:

* CVE-2015-2316
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2316>
* CVE-2015-2317
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2317>

python-django was updated to 1.5.10 fixing bugs and security issues:

* Prevented reverse() from generating URLs pointing to other hosts to
  prevent phishing attacks. (bnc#893087, CVE-2014-0480)
* Removed O(n) algorithm when uploading duplicate file names to fix
  file upload denial of service. (bnc#893088, CVE-2014-0481)
* Modified RemoteUserMiddleware to logout on REMOTE_USE change to
  prevent session hijacking. (bnc#893089, CVE-2014-0482)
* Prevented data leakage in contrib.admin via query string
  manipulation. (bnc#893090, CVE-2014-0483)

Security Issues:

* CVE-2014-0480
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0480>
* CVE-2014-0481
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0481>
* CVE-2014-0482
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0482>
* CVE-2014-0483
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0483>

python-django was updated to 1.6.11 to fix security issues and non-security bugs.

The following vulnerabilities were fixed:

• Made is_safe_url() reject URLs that start with control characters to mitigate possible XSS attack via user-supplied redirect URLs (bnc#923176, CVE-2015-2317)
• Fixed an infinite loop possibility in strip_tags() (bnc#923172, CVE-2015-2316)
• WSGI header spoofing via underscore/dash conflation (bnc#913053, CVE-2015-0219)
• Mitigated possible XSS attack via user-supplied redirect URLs
• Denial-of-service attack against django.views.static.serve (bnc#913056, CVE-2015-0221)
• Database denial-of-service with ModelMultipleChoiceField (bnc#913055, CVE-2015-0222)

The update also contains fixes for non-security bugs, functional and stability issues.

python-django was updated to 1.6.11 to fix security issues and non-security bugs.

The following vulnerabilities were fixed:

• Made is_safe_url() reject URLs that start with control characters to mitigate possible XSS attack via user-supplied redirect URLs (bnc#923176, CVE-2015-2317)
• Fixed an infinite loop possibility in strip_tags() (bnc#923172, CVE-2015-2316)
• WSGI header spoofing via underscore/dash conflation (bnc#913053, CVE-2015-0219)
• Mitigated possible XSS attack via user-supplied redirect URLs
• Denial-of-service attack against django.views.static.serve (bnc#913056, CVE-2015-0221)
• Database denial-of-service with ModelMultipleChoiceField (bnc#913055, CVE-2015-0222)

The update also contains fixes for non-security bugs, functional and stability issues.

The utils.html.strip_tags function in Django 1.6.x before 1.6.11, 1.7.x before 1.7.7, and 1.8.x before 1.8c1, when using certain versions of Python, allows remote attackers to cause a denial of service (infinite loop) by increasing the length of the input string.

Andrey Babak discovered that Django incorrectly handled strip_tags. A remote attacker could possibly use this issue to cause Django to enter an infinite loop, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 14.10. (CVE-2015-2316)

Daniel Chatfield discovered that Django incorrectly handled user-supplied redirect URLs. A remote attacker could possibly use this issue to perform a cross-site scripting attack. (CVE-2015-2317)