CVE-2017-7820

2017-10-0200:00:00

ubuntu.com

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

0.005

Percentile

76.1%

JSON

The “instanceof” operator can bypass the Xray wrapper mechanism. When
called on web content from the browser itself or an extension the web
content can provide its own result for that operator, possibly tricking the
browser or extension into mishandling the element. This vulnerability
affects Firefox < 56.

OSVersionArchitecturePackageVersionFilename
ubuntu17.10noarchfirefox< 56.0+build6-0ubuntu1UNKNOWN
ubuntu18.04noarchfirefox< 56.0+build6-0ubuntu1UNKNOWN
ubuntu14.04noarchfirefox< 56.0+build6-0ubuntu0.14.04.1UNKNOWN
ubuntu16.04noarchfirefox< 56.0+build6-0ubuntu0.16.04.1UNKNOWN
ubuntu17.04noarchfirefox< 56.0+build6-0ubuntu0.17.04.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	17.10	noarch	firefox	< 56.0+build6-0ubuntu1	UNKNOWN
ubuntu	18.04	noarch	firefox	< 56.0+build6-0ubuntu1	UNKNOWN
ubuntu	14.04	noarch	firefox	< 56.0+build6-0ubuntu0.14.04.1	UNKNOWN
ubuntu	16.04	noarch	firefox	< 56.0+build6-0ubuntu0.16.04.1	UNKNOWN
ubuntu	17.04	noarch	firefox	< 56.0+build6-0ubuntu0.17.04.1	UNKNOWN