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CVE-2011-1521

6.4 · MEDIUM

The urllib and urllib2 modules in Python 2.x before 2.7.2 and 3.x before 3.2.1 process Location headers that specify redirection to file: URLs, which makes it easier for remote attackers to obtain…

Published May 24, 2011pythonCWE-399EPSS 3.56%

Overview

CVE-2011-1521 is a medium-severity vulnerability affecting python python. It was published on May 24, 2011 and has a CVSS 2.0 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The urllib and urllib2 modules in Python 2.x before 2.7.2 and 3.x before 3.2.1 process Location headers that specify redirection to file: URLs, which makes it easier for remote attackers to obtain sensitive information or cause a denial of service (resource consumption) via a crafted URL, as demonstrated by the file:///etc/passwd and file:///dev/zero URLs.

Remediation

Check the references section for vendor advisories and patches from python. Update python to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refbugs.python.org/issue11662Refhg.python.org/cpython/file/96a6c128822b/Misc/NEWSRefhg.python.org/cpython/file/b2934d98dac1/Misc/NEWSRefhg.python.org/cpython/rev/96a6c128822b/Refhg.python.org/cpython/rev/b2934d98dac1/Reflists.apple.com/archives/Security-announce/2011//Oct/msg00003.htmlReflists.opensuse.org/opensuse-security-announce/2011-05/msg00005.htmlRefopenwall.com/lists/oss-security/2011/03/24/5Refopenwall.com/lists/oss-security/2011/03/28/2Refopenwall.com/lists/oss-security/2011/09/11/1

How CyberStrike helps

Frequently asked questions

What is CVE-2011-1521?

CVE-2011-1521 is a medium-severity vulnerability affecting python python. It was published on May 24, 2011 and has a CVSS 2.0 base score of 6.4 (MEDIUM).

How severe is CVE-2011-1521?

This vulnerability has a CVSS 2.0 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-1521?

Check the references section for vendor advisories and patches from python. Update python to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-1521?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-1521 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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