Multiple vulnerabilities in libexpat

Published: 2024-02-07

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-52426 CVE-2023-52425
CWE-ID	CWE-776 CWE-400
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	expat Universal components / Libraries / Libraries used by multiple products
Vendor	libexpat.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) XML Entity Expansion

EUVDB-ID: #VU86231

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-52426

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to recursive XML Entity Expansion if XML_DTD is undefined at compile time. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

expat: 2.0.0 - 2.5.0

CPE2.3

External links

https://github.com/libexpat/libexpat/pull/777
https://github.com/libexpat/libexpat/commit/0f075ec8ecb5e43f8fdca5182f8cca4703da0404

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource exhaustion

EUVDB-ID: #VU86230