Mozilla Firefox/Firefox ESR Private Browsing Persistent information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Mozilla Firefox and Firefox ESR. This impacts an unknown function of the component Private Browsing. Such manipulation leads to information disclosure (Persistent). This vulnerability is listed as CVE-2017-7843. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Firefox and Firefox ESR (Web Browser) (unknown version). It has been rated as problematic. Affected by this issue is an unknown code block of the component Private Browsing. The manipulation with an unknown input leads to a information disclosure vulnerability (Persistent). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1.

The bug was discovered 11/29/2017. The weakness was presented 06/11/2018 as Bug 1410106 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is handled as CVE-2017-7843 since 04/12/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 105060 (CentOS 6 / 7 : firefox (CESA-2017:3382)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 296020 (Solaris 11.3 Support Repository Update (SRU) 28.4.0 Missing).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (105060) and SecurityFocus (BID 102039†). See VDB-79333, VDB-107254 and VDB-119349 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Persistent
Class: Information disclosure / Persistent
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 105060
Nessus Name: CentOS 6 / 7 : firefox (CESA-2017:3382)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 902789
OpenVAS Name: CentOS Update for firefox CESA-2017:3382 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/12/2017 🔍
11/29/2017 +231 days 🔍
11/29/2017 +0 days 🔍
12/06/2017 +7 days 🔍
12/07/2017 +1 days 🔍
06/11/2018 +185 days 🔍
06/11/2018 +0 days 🔍
06/12/2018 +1 days 🔍
11/26/2025 +2724 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1410106
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7843 (🔍)
GCVE (CVE): GCVE-0-2017-7843
GCVE (VulDB): GCVE-100-119348

OVAL: 🔍

SecurityFocus: 102039 - Mozilla Firefox MFSA2017-27 Multiple Security Vulnerabilities
SecurityTracker: 1039954

See also: 🔍

Entryinfo

Created: 06/12/2018 08:57
Updated: 11/26/2025 06:37
Changes: 06/12/2018 08:57 (79), 02/18/2020 08:37 (4), 03/22/2023 13:54 (4), 11/26/2025 06:37 (17)
Complete: 🔍
Cache ID: 216:A78:103

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