Mozilla Firefox up to 50 XSLT Document use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in Mozilla Firefox up to 50 and classified as critical. This issue affects some unknown processing of the component XSLT Document Handler. This manipulation causes use after free. This vulnerability is handled as CVE-2017-5376. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 50 (Web Browser). It has been declared as critical. Affected by this vulnerability is an unknown part of the component XSLT Document Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Use-after-free while manipulating XSL in XSLT documents. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

The bug was discovered 01/24/2017. The weakness was released 01/24/2017 as MFSA 2017-01 as confirmed security advisory (Website). The advisory is shared at mozilla.org. This vulnerability is known as CVE-2017-5376 since 01/13/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 96804 (Slackware 14.1 / 14.2 / current : mozilla-thunderbird (SSA:2017-026-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175948 (Debian Security Update for firefox-esr (DSA 3771-1)).

Upgrading to version 51 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 (96804), SecurityFocus (BID 95758†) and SecurityTracker (ID 1037693†). Entries connected to this vulnerability are available at VDB-96002, VDB-96003, VDB-96004 and VDB-96005. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 9.8
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: Use after free
CWE: CWE-416 / CWE-119
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: 96804
Nessus Name: Slackware 14.1 / 14.2 / current : mozilla-thunderbird (SSA:2017-026-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881932
OpenVAS Name: CentOS Update for thunderbird CESA-2017:0238 centos7
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 51

Timelineinfo

01/13/2017 🔍
01/24/2017 +11 days 🔍
01/24/2017 +0 days 🔍
01/24/2017 +0 days 🔍
01/24/2017 +0 days 🔍
01/25/2017 +1 days 🔍
01/26/2017 +1 days 🔍
01/27/2017 +1 days 🔍
06/11/2018 +499 days 🔍
11/26/2025 +2725 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2017-01
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5376 (🔍)
GCVE (CVE): GCVE-0-2017-5376
GCVE (VulDB): GCVE-100-96001

OVAL: 🔍

SecurityFocus: 95758 - Mozilla Firefox CVE-2017-5376 Denial of Service Vulnerability
OSVDB: - CVE-2017-5376 - Mozilla - Multiple Products - Use-After-Free Issue
SecurityTracker: 1037693

See also: 🔍

Entryinfo

Created: 01/26/2017 15:17
Updated: 11/26/2025 02:01
Changes: 01/26/2017 15:17 (82), 08/02/2020 09:46 (6), 11/26/2025 02:01 (17)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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