libexpat up to 2.6.2 on 32-bit xmlparse.c nDefaultAtts UINT_MAX integer overflow

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.
7.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in libexpat up to 2.6.2 on 32-bit. Affected by this issue is the function nDefaultAtts of the file xmlparse.c. Such manipulation of the argument UINT_MAX leads to integer overflow. This vulnerability is referenced as CVE-2024-45491. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libexpat up to 2.6.2 on 32-bit. It has been rated as problematic. Affected by this issue is the function nDefaultAtts of the file xmlparse.c. The manipulation of the argument UINT_MAX with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. The impact remains unknown. CVE summarizes:

An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2024-45491 since 08/30/2024. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 207755 (AlmaLinux 8 : expat (ALSA-2024:6989)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.6.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (207755), EUVD (EUVD-2024-41510) and CERT Bund (WID-SEC-2024-1951). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • IBM AIX
  • Debian Linux
  • IBM DB2
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Xerox FreeFlow Print Server
  • Oracle Linux
  • IBM Tivoli Network Manager
  • HCL Commerce
  • NetApp ActiveIQ Unified Manager
  • Siemens SIMATIC S7
  • Hitachi Energy RTU500
  • RESF Rocky Linux
  • OpenBSD OpenBSD
  • Broadcom Brocade SANnav
  • Dell PowerScale OneFS
  • Open Source expat
  • Tenable Security Nessus
  • Tenable Security Nessus Network Monitor
  • Red Hat OpenShift
  • IBM QRadar SIEM
  • Dell Avamar
  • NetApp Data ONTAP
  • Juniper Junos Space
  • Red Hat JBoss Core Services
  • Dell integrated Dell Remote Access Controller
  • Dell PowerProtect Data Domain
  • Dell PowerProtect Data Domain Management Center
  • Dell PowerProtect Data Domain OS

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 7.3
CNA Vector (MITRE): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
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: 207755
Nessus Name: AlmaLinux 8 : expat (ALSA-2024:6989)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libexpat 2.6.3
Patch: github.com

Timelineinfo

08/30/2024 🔍
08/30/2024 +0 days 🔍
08/30/2024 +0 days 🔍
01/04/2026 +492 days 🔍

Sourcesinfo

Product: github.com

Advisory: 888
Status: Confirmed

CVE: CVE-2024-45491 (🔍)
GCVE (CVE): GCVE-0-2024-45491
GCVE (VulDB): GCVE-100-276200
EUVD: 🔍
CERT Bund: WID-SEC-2024-1951 - expat: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 08/30/2024 07:13
Updated: 01/04/2026 21:19
Changes: 08/30/2024 07:13 (58), 08/31/2024 13:53 (12), 09/05/2024 03:44 (11), 09/29/2024 23:24 (2), 09/01/2025 21:23 (7), 11/05/2025 15:45 (1), 01/04/2026 21:19 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!