CVE-2017-7761

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54.

La aplicación "helper.exe" de Mozilla Maintenance Service crea un directorio temporal escribible por usuarios no privilegiados. Cuando esto se combina con la creación de un junction (un tipo de vínculo simbólico), los archivos protegidos en el directorio objetivo del junction pueden ser eliminados por Mozilla Maintenance Service, el cual tiene acceso privilegiado. Nota: Este ataque requiere acceso local al sistema y solo afecta a Windows. Otros sistemas operativos no se han visto afectados. La vulnerabilidad afecta a Firefox ESR en versiones anteriores a la 52.2 y Firefox en versiones anteriores a la 54.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-04-12 CVE Reserved
2018-06-11 CVE Published
2023-06-05 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-276: Incorrect Default Permissions

CAPEC

References (6)

URL	Tag	Source
http://www.securityfocus.com/bid/99057	Third Party Advisory
http://www.securitytracker.com/id/1038689	Third Party Advisory
https://sourceforge.net/p/nsis/bugs/1125	Issue Tracking

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://bugzilla.mozilla.org/show_bug.cgi?id=1215648	2019-10-03
https://www.mozilla.org/security/advisories/mfsa2017-15	2019-10-03
https://www.mozilla.org/security/advisories/mfsa2017-16	2019-10-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"	Firefox Search vendor "Mozilla" for product "Firefox"	< 54.0 Search vendor "Mozilla" for product "Firefox" and version " < 54.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Mozilla Search vendor "Mozilla"	Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"	< 52.2.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 52.2.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe