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CVE-2015-4490

4.3 · MEDIUM

The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem…

Published Aug 16, 2015mozillaCWE-79EPSS 2.95%

Overview

CVE-2015-4490 is a medium-severity vulnerability affecting mozilla firefox. It was published on August 16, 2015 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.

Remediation

Check the references section for vendor advisories and patches from mozilla. Update firefox 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
mozillafirefox0Affected

References

Reflists.opensuse.org/opensuse-security-announce/2015-08/msg00014.htmlReflists.opensuse.org/opensuse-security-announce/2015-08/msg00015.htmlRefwww.mozilla.org/security/announce/2015/mfsa2015-91.htmlRefwww.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlRefwww.securitytracker.com/id/1033247Refwww.ubuntu.com/usn/USN-2702-1Refwww.ubuntu.com/usn/USN-2702-2Refwww.ubuntu.com/usn/USN-2702-3Refbugzilla.mozilla.org/show_bug.cgi?id=1086999Refsecurity.gentoo.org/glsa/201605-06

How CyberStrike helps

Frequently asked questions

What is CVE-2015-4490?

CVE-2015-4490 is a medium-severity vulnerability affecting mozilla firefox. It was published on August 16, 2015 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2015-4490?

This vulnerability has a CVSS 2.0 base score of 4.3, 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-2015-4490?

Check the references section for vendor advisories and patches from mozilla. Update firefox 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-2015-4490?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-4490 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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