Mozilla Thunderbird up to 61.x Refresh Driver Timer 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-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Mozilla Thunderbird up to 61.x. Affected is an unknown function of the component Refresh Driver Timer. Such manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2018-12377. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird up to 61.x (Mail Client Software) and classified as critical. Affected by this issue is an unknown function of the component Refresh Driver Timer. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

The bug was discovered 09/05/2018. The weakness was disclosed 10/18/2018 by Holger Fuhrmannek (Alex) as Bug 1470260 as confirmed bug report (Bugzilla). The advisory is available at bugzilla.mozilla.org. This vulnerability is handled as CVE-2018-12377 since 06/14/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/26/2025).

The vulnerability scanner Nessus provides a plugin with the ID 117291 (Mozilla Firefox < 62 Multiple Critical Vulnerabilities (macOS)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176516 (Debian Security Update for thunderbird (DSA 4327-1)).

Upgrading to version 62.0 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (117291) and SecurityFocus (BID 105280†). The entries VDB-109144, VDB-125760, VDB-125761 and VDB-125763 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

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
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 117291
Nessus Name: Mozilla Firefox < 62 Multiple Critical Vulnerabilities (macOS)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Thunderbird 62.0

Timelineinfo

06/14/2018 🔍
09/05/2018 +83 days 🔍
09/05/2018 +0 days 🔍
09/05/2018 +0 days 🔍
09/06/2018 +1 days 🔍
10/18/2018 +41 days 🔍
10/18/2018 +0 days 🔍
10/19/2018 +1 days 🔍
11/26/2025 +2595 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1470260
Researcher: Holger Fuhrmannek (Alex)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12377 (🔍)
GCVE (CVE): GCVE-0-2018-12377
GCVE (VulDB): GCVE-100-125762

OVAL: 🔍

SecurityFocus: 105280 - Mozilla Firefox and Firefox ESR Multiple Security Vulnerabilities
SecurityTracker: 1041610

See also: 🔍

Entryinfo

Created: 10/19/2018 06:43
Updated: 11/26/2025 08:20
Changes: 10/19/2018 06:43 (78), 04/05/2020 12:35 (6), 05/30/2023 10:26 (4), 11/26/2025 08:20 (15)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!