CVE-2015-4490

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.

Category

4.3
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.21%
Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory mozilla.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1086999 issue tracking
http://www.ubuntu.com/usn/USN-2702-3 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html third party advisory vendor advisory
http://www.mozilla.org/security/announce/2015/mfsa2015-91.html vendor advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html third party advisory
http://www.securitytracker.com/id/1033247 vdb entry
http://www.ubuntu.com/usn/USN-2702-2 third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-2702-1 third party advisory vendor advisory
https://security.gentoo.org/glsa/201605-06 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2015-4490?
CVE-2015-4490 has been scored as a medium severity vulnerability.
How to fix CVE-2015-4490?
To fix CVE-2015-4490, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-4490 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2015-4490 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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