CVE-2017-7791

Public Exploit

Description

On pages containing an iframe, the "data:" protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Category

5.3
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.35% Top 25%
Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Thunderbird
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2017-19/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2017-20/ vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1365875 issue tracking patch vendor advisory exploit
https://www.debian.org/security/2017/dsa-3968 third party advisory vendor advisory
https://www.mozilla.org/security/advisories/mfsa2017-18/ vendor advisory
https://access.redhat.com/errata/RHSA-2017:2456 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2017:2534 third party advisory vendor advisory
http://www.securityfocus.com/bid/100240 vdb entry third party advisory
http://www.securitytracker.com/id/1039124 vdb entry third party advisory
https://security.gentoo.org/glsa/201803-14 third party advisory vendor advisory
https://www.debian.org/security/2017/dsa-3928 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-7791?
CVE-2017-7791 has been scored as a medium severity vulnerability.
How to fix CVE-2017-7791?
To fix CVE-2017-7791, 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-2017-7791 being actively exploited in the wild?
It is possible that CVE-2017-7791 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-7791?
CVE-2017-7791 affects Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox.
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