Vulnerability CVE-2017-7839

Vulnerability Name:

CVE-2017-7839 (CCN-134841)

Assigned:

2017-11-14

Published:

2017-11-14

Updated:

2018-06-25

Summary:

Control characters prepended before "javascript:" URLs pasted in the addressbar can cause the leading characters to be ignored and the pasted JavaScript to be executed instead of being blocked. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks where users are convinced to copy and paste text into the addressbar. This vulnerability affects Firefox < 57.

CVSS v3 Severity:

6.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): Low Integrity (I): Low Availibility (A): None

6.1 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): Low Integrity (I): Low Availibility (A): None

CVSS v2 Severity:

4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

5.5 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): None

Vulnerability Type:

CWE-79

Vulnerability Consequences:

Cross-Site Scripting

References:

Source: MITRE
Type: CNA
CVE-2017-7839

Source: BID
Type: Third Party Advisory, VDB Entry
101832

Source: CCN
Type: BID-101832
Mozilla Firefox Prior to 57 Multiple Security Vulnerabilities

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1039803

Source: CONFIRM
Type: Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1402896

Source: XF
Type: UNKNOWN
firefox-cve20177839-xss(134841)

Source: CCN
Type: Mozilla Foundation Security Advisory 2017-24
Security vulnerabilities fixed in Firefox 57

Source: CONFIRM
Type: Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-24/

Vulnerable Configuration:

Configuration 1:

cpe:/a:mozilla:firefox:*:*:*:*:*:*:*:* (Version <= 56.0.2)

Configuration CCN 1:

cpe:/a:mozilla:firefox:56.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:20177839	V	CVE-2017-7839	2022-06-30
oval:org.opensuse.security:def:111899	P	MozillaFirefox-92.0-1.2 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:105476	P	MozillaFirefox-92.0-1.2 on GA media (Moderate)	2021-10-01
oval:com.ubuntu.artful:def:20177839000	V	CVE-2017-7839 on Ubuntu 17.10 (artful) - low.	2018-06-11
oval:com.ubuntu.bionic:def:20177839000	V	CVE-2017-7839 on Ubuntu 18.04 LTS (bionic) - low.	2018-06-11
oval:com.ubuntu.bionic:def:201778390000000	V	CVE-2017-7839 on Ubuntu 18.04 LTS (bionic) - low.	2018-06-11
oval:com.ubuntu.trusty:def:20177839000	V	CVE-2017-7839 on Ubuntu 14.04 LTS (trusty) - low.	2018-06-11
oval:com.ubuntu.xenial:def:201778390000000	V	CVE-2017-7839 on Ubuntu 16.04 LTS (xenial) - low.	2018-06-11
oval:com.ubuntu.xenial:def:20177839000	V	CVE-2017-7839 on Ubuntu 16.04 LTS (xenial) - low.	2018-06-11

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