Mozilla Firefox up to 47 Expat XML Parser memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 47. It has been classified as critical. Affected by this vulnerability is an unknown functionality of the component Expat XML Parser. The manipulation leads to memory corruption. This vulnerability is documented as CVE-2016-0718. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 47 (Web Browser). It has been rated as very critical. This issue affects an unknown code block of the component Expat XML Parser. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.

The weakness was released 08/02/2016 by Gustavo Grieco as MFSA 2016-68 as confirmed security advisory (Website). It is possible to read the advisory at mozilla.org. The identification of this vulnerability is CVE-2016-0718. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/09/2022). The advisory points out:

Security researcher Gustavo Grieco reported a potential out-of-bounds read parsing malformed XML data during character conversion. This is due to a bug in the Expat library, which is used in Firefox. This could allow an attacker to read other inaccessible memory.

The vulnerability scanner Nessus provides a plugin with the ID 109594 (FreeBSD : python 2.7 -- multiple vulnerabilities (8719b935-8bae-41ad-92ba-3c826f651219)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168881 (OpenSuSE Security Update for expat (openSUSE-SU-2016:1441-1)).

Upgrading to version 48 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 (109594), SecurityFocus (BID 90729†) and SecurityTracker (ID 1036508†). Entries connected to this vulnerability are available at VDB-87628, VDB-89749, VDB-90193 and VDB-90194. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: 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: 109594
Nessus Name: FreeBSD : python 2.7 -- multiple vulnerabilities (8719b935-8bae-41ad-92ba-3c826f651219)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800495
OpenVAS Name: Apple iTunes Multiple Vulnerabilities-HT207599 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: Firefox 48

Timelineinfo

12/16/2015 🔍
05/18/2016 +154 days 🔍
05/26/2016 +8 days 🔍
08/02/2016 +68 days 🔍
08/02/2016 +0 days 🔍
08/03/2016 +1 days 🔍
08/04/2016 +1 days 🔍
05/07/2018 +641 days 🔍
09/09/2022 +1586 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2016-68
Researcher: Gustavo Grieco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0718 (🔍)
GCVE (CVE): GCVE-0-2016-0718
GCVE (VulDB): GCVE-100-90431

OVAL: 🔍

SecurityFocus: 90729 - Expat CVE-2016-0718 Buffer Overflow Vulnerability
SecurityTracker: 1036508

See also: 🔍

Entryinfo

Created: 08/04/2016 09:21
Updated: 09/09/2022 17:10
Changes: 08/04/2016 09:21 (63), 03/16/2019 20:49 (24), 09/09/2022 17:10 (3)
Complete: 🔍
Cache ID: 216:AD3:103

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

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