Vulnerability identifier: #VU21091

Vulnerability risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-15903

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: libexpat.org

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary error when processing XML documents within the expat library. A remote attacker can create a specially crafted XML file, pass it to the affected application, trigger out-of-bounds read error and read contents of memory on the system or crash the affected application.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

expat: 2.2.0 - 2.2.7

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External links
http://github.com/libexpat/libexpat/commit/c20b758c332d9a13afbbb276d30db1d183a85d43
http://github.com/libexpat/libexpat/issues/317
http://github.com/libexpat/libexpat/pull/318

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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. However, proof of concept for this vulnerability is available.