Pale Moon up to 27.9.2 EnsureExpandoObject use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in Pale Moon up to 27.9.2 and classified as critical. The affected element is the function DOMProxyHandler::EnsureExpandoObject. This manipulation causes use after free. This vulnerability is handled as CVE-2018-12292. The attack can be initiated remotely. Additionally, an exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Pale Moon up to 27.9.2. Affected by this vulnerability is the function DOMProxyHandler::EnsureExpandoObject. 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 exists in DOMProxyHandler::EnsureExpandoObject in Pale Moon before 27.9.3.

The bug was discovered 06/12/2018. The weakness was released 06/13/2018 (Website). The advisory is shared at palemoon.org. This vulnerability is known as CVE-2018-12292 since 06/13/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371017 (Pale Moon Browser Use-After-Free Vulnerability).

Upgrading to version 27.9.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (44900). Entries connected to this vulnerability are available at VDB-94929, VDB-108404, VDB-108466 and VDB-108483. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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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: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Pale Moon 27.9.3

Timelineinfo

06/12/2018 🔍
06/13/2018 +0 days 🔍
06/13/2018 +0 days 🔍
06/13/2018 +0 days 🔍
06/14/2018 +1 days 🔍
10/14/2025 +2679 days 🔍

Sourcesinfo

Advisory: palemoon.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12292 (🔍)
GCVE (CVE): GCVE-0-2018-12292
GCVE (VulDB): GCVE-100-119521
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/14/2018 10:20
Updated: 10/14/2025 05:35
Changes: 06/14/2018 10:20 (61), 02/19/2020 10:05 (5), 10/14/2025 05:35 (18)
Complete: 🔍
Cache ID: 216::103

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

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