VDB-134161 · CVE-2019-9796 · RHSA-2019:0966

Mozilla Firefox/Firefox ESR/Thunderbird SMIL Animation Controller use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.9	$0-$5k	0.00

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (version now known). It has been declared as critical. Affected by this vulnerability is some unknown processing of the component SMIL Animation Controller. 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:

A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves a dangling pointer to the driver's observer array. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

The bug was discovered 03/19/2019. The weakness was released 04/26/2019 by Markus Vervier (Nils) with X41 D-Sec GmbH (Website). The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2019-9796 since 03/14/2019. 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 price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/07/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 38 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157940 (Oracle Enterprise Linux Security Update for firefox (ELSA-2019-0623)).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106773†). Entries connected to this vulnerability are available at VDB-130538, VDB-134153, VDB-134155 and VDB-134156.

Productinfo

Type

Web Browser

Vendor

Mozilla

Name

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/29/2019 🔍
03/14/2019 +44 days 🔍
03/19/2019 +5 days 🔍
04/26/2019 +38 days 🔍
04/27/2019 +1 days 🔍
09/07/2023 +1594 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: RHSA-2019:0966
Researcher: Markus Vervier (Nils)
Organization: X41 D-Sec GmbH
Status: Confirmed

CVE: CVE-2019-9796 (🔍)
SecurityFocus: 106773 - Mozilla Firefox MFSA2019-01 Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 04/27/2019 09:05 AM
Updated: 09/07/2023 05:46 PM
Changes: 04/27/2019 09:05 AM (61), 06/03/2020 06:55 AM (7), 09/07/2023 05:46 PM (4)
Complete: 🔍
Cache ID: 18:5D7:40