#VU7242 Improper Restriction of XML External Entity Reference in expat


Published: 2017-06-25 | Updated: 2017-10-04

Vulnerability identifier: #VU7242

Vulnerability risk: Low

CVSSv3.1:

CVE-ID: CVE-2017-9233

CWE-ID: CWE-611

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
expat
Universal components / Libraries / Libraries used by multiple products

Vendor: libexpat.org

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

The vulnerability exists due to an error within entityValueInitProcessor() function while parsing malformed XML in an external entity. An attacker can take advantage of this flaw to cause a denial of service against an application using the Expat library.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service attack.

Mitigation
Update to version 2.2.1.

Vulnerable software versions

expat: 1.95.0 - 2.2.0


CPE

External links
http://github.com/libexpat/libexpat/commit/c4bf96bb51dd2a1b0e185374362ee136fe2c9d7f
http://libexpat.github.io/doc/cve-2017-9233/


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


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