Debian update for expat



| Updated: 2021-06-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-20843
CWE-ID CWE-611
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 expat (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) XML External Entity injection

EUVDB-ID: #VU18923

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2018-20843

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input including XML names that contain a large number of colons. A remote attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

Mitigation

Update the affected package to version: 2.2.0-2+deb9u2.

Vulnerable software versions

expat (Debian package): 2.2.0-2+deb9u1

CPE2.3 External links

https://www.debian.org/security/2019/dsa-4472


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.



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