#VU44585 Resource management error in Django - CVE-2011-4137

Vulnerability identifier: #VU44585

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-4137

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Django
Web applications / CMS

Vendor: Django Software Foundation

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The verify_exists functionality in the URLField implementation in Django before 1.2.7 and 1.3.x before 1.3.1 relies on Python libraries that attempt access to an arbitrary URL with no timeout, which allows remote attackers to cause a denial of service (resource consumption) via a URL associated with (1) a slow response, (2) a completed TCP connection with no application data sent, or (3) a large amount of application data, a related issue to CVE-2011-1521.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Django: 0.91 - 0.96, 1.0 - 1.3

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External links
https://openwall.com/lists/oss-security/2011/09/11/1
https://openwall.com/lists/oss-security/2011/09/13/2
https://openwall.com/lists/oss-security/2011/09/15/5
https://secunia.com/advisories/46614
https://www.debian.org/security/2011/dsa-2332
https://bugzilla.redhat.com/show_bug.cgi?id=737366
https://hermes.opensuse.org/messages/14700881
https://www.djangoproject.com/weblog/2011/sep/09/
https://www.djangoproject.com/weblog/2011/sep/10/127/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.