Mozilla Firefox up to 54 AppCache Fallback Hijacking 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Mozilla Firefox up to 54. Affected by this issue is some unknown functionality of the component AppCache Fallback Handler. Such manipulation leads to 7pk security (Hijacking). This vulnerability is referenced as CVE-2017-7807. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 54 (Web Browser) and classified as critical. Affected by this issue is an unknown functionality of the component AppCache Fallback Handler. The manipulation with an unknown input leads to a 7pk security vulnerability (Hijacking). Using CWE to declare the problem leads to CWE-254. Impacted is confidentiality, integrity, and availability.

The bug was discovered 08/08/2017. The weakness was published 08/08/2017 as MFSA 2017-18 as confirmed security advisory (Website). The advisory is shared for download at mozilla.org. This vulnerability is handled as CVE-2017-7807 since 04/12/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1211.

The vulnerability scanner Nessus provides a plugin with the ID 102882 (CentOS 6 / 7 : thunderbird (CESA-2017:2534)), 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 236453 (Red Hat Update for firefox (RHSA-2017:2456)).

Upgrading to version 55 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 (102882), SecurityFocus (BID 100242†) and SecurityTracker (ID 1039124†). Similar entries are available at VDB-105249, VDB-105250, VDB-105251 and VDB-105252. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
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: Hijacking
Class: 7pk security / Hijacking
CWE: CWE-254
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: 102882
Nessus Name: CentOS 6 / 7 : thunderbird (CESA-2017:2534)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703926
OpenVAS Name: Debian Security Advisory DSA 3928-1 (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 55

Timelineinfo

04/12/2017 🔍
08/08/2017 +118 days 🔍
08/08/2017 +0 days 🔍
08/08/2017 +0 days 🔍
08/08/2017 +0 days 🔍
08/10/2017 +2 days 🔍
08/12/2017 +2 days 🔍
09/01/2017 +20 days 🔍
06/11/2018 +282 days 🔍
11/26/2025 +2725 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2017-18
Researcher: Mathias Karlsson.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7807 (🔍)
GCVE (CVE): GCVE-0-2017-7807
GCVE (VulDB): GCVE-100-105260

OVAL: 🔍

SecurityFocus: 100242 - Mozilla Firefox CVE-2017-7807 Security Bypass Vulnerability
SecurityTracker: 1039124

See also: 🔍

Entryinfo

Created: 08/13/2017 00:07
Updated: 11/26/2025 06:09
Changes: 08/13/2017 00:07 (82), 11/06/2019 15:47 (5), 01/09/2021 09:08 (2), 01/09/2021 09:12 (1), 11/26/2025 06:09 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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