Vulnerability CVE-2017-7796

Vulnerability Name:

CVE-2017-7796 (CCN-130184)

Assigned:

2017-08-08

Published:

2017-08-08

Updated:

2018-08-09

Summary:

On Windows systems, the logger run by the Windows updater deletes the file "update.log" before it runs in order to write a new log of that name. The path to this file is supplied at the command line to the updater and could be used in concert with another local exploit to delete a different file named "update.log" instead of the one intended.
Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Firefox < 55.

CVSS v3 Severity:

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

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

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

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

CVSS v2 Severity:

3.3 Low (CVSS v2 Vector: AV:L/AC:M/Au:N/C:N/I:P/A:P)

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

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

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

Vulnerability Type:

CWE-20

Vulnerability Consequences:

File Manipulation

References:

Source: MITRE
Type: CNA
CVE-2017-7796

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1039124

Source: CONFIRM
Type: Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1234401

Source: XF
Type: UNKNOWN
firefox-cve20177796-file-deletion(130184)

Source: CCN
Type: Mozilla Foundation Security Advisory 2017-18
Security vulnerabilities fixed in Firefox 55

Source: CONFIRM
Type: Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-18/

Vulnerable Configuration:

Configuration 1:

cpe:/a:mozilla:firefox:*:*:*:*:*:*:*:* (Version < 55.0)

AND

cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

Configuration CCN 1:

cpe:/a:mozilla:firefox:54.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:20177796	V	CVE-2017-7796	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.trusty:def:20177796000	V	CVE-2017-7796 on Ubuntu 14.04 LTS (trusty) - medium.	2018-06-11
oval:com.ubuntu.xenial:def:20177796000	V	CVE-2017-7796 on Ubuntu 16.04 LTS (xenial) - medium.	2018-06-11
oval:com.ubuntu.xenial:def:201777960000000	V	CVE-2017-7796 on Ubuntu 16.04 LTS (xenial) - medium.	2018-06-11

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