Denial of service in expat library



Published: 2022-10-25
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-43680
CWE-ID CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		expat
Universal components / Libraries / Libraries used by multiple products

Vendor libexpat.org

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU68718

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-43680

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate. A remote attacker can trigger a use-after-free error and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

expat: 1.95.0 - 2.4.9

External links

http://github.com/libexpat/libexpat/pull/650
http://github.com/libexpat/libexpat/pull/616
http://github.com/libexpat/libexpat/issues/649


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.



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