Mozilla Firefox up to 55 CSP cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability has been found in Mozilla Firefox up to 55 and classified as critical. This affects an unknown part of the component CSP. Performing a manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2017-7823. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 55 (Web Browser). It has been classified as critical. This affects an unknown part of the component CSP. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity.

The bug was discovered 09/28/2017. The weakness was shared 09/28/2017 by Martin as MFSA 2017-21 as confirmed security advisory (Website). It is possible to read the advisory at mozilla.org. This vulnerability is uniquely identified as CVE-2017-7823 since 04/12/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 108820 (GLSA-201803-14 : Mozilla Thunderbird: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370584 (Mozilla Firefox Multiple Vulnerabilities. (mfsa2017-21,mfsa2017-22)).

Upgrading to version 56 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108820), SecurityFocus (BID 101059†) and SecurityTracker (ID 1039465†). The entries VDB-107430, VDB-107431, VDB-107432 and VDB-107433 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.4
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

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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: 108820
Nessus Name: GLSA-201803-14 : Mozilla Thunderbird: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3987-1 (firefox-esr - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Firefox 56

Timelineinfo

04/12/2017 🔍
09/28/2017 +169 days 🔍
09/28/2017 +0 days 🔍
09/28/2017 +0 days 🔍
09/28/2017 +0 days 🔍
09/29/2017 +1 days 🔍
10/04/2017 +5 days 🔍
04/04/2018 +182 days 🔍
06/11/2018 +67 days 🔍
11/26/2025 +2725 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2017-21
Researcher: Khalil Zhani, Fran, ccedil, ois Marier, Martin Thomson. (Martin)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7823 (🔍)
GCVE (CVE): GCVE-0-2017-7823
GCVE (VulDB): GCVE-100-107439

OVAL: 🔍

SecurityFocus: 101059 - Mozilla Firefox and Firefox ESR Multiple Security Vulnerabilities
SecurityTracker: 1039465

See also: 🔍

Entryinfo

Created: 10/04/2017 11:52
Updated: 11/26/2025 06:09
Changes: 10/04/2017 11:52 (82), 11/21/2019 19:54 (5), 01/15/2021 12:30 (2), 01/15/2021 12:34 (1), 11/26/2025 06:09 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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