XML External Entity injection in Yaws - CVE-2020-24379

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Main Vulnerability Database Vulnerabilities #VU47119

XML External Entity injection in Yaws - CVE-2020-24379

Published: September 9, 2020 / Updated: September 27, 2020


Vulnerability identifier: #VU47119
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-24379
CWE-ID: CWE-611
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to insufficient validation of user-supplied XML input within WebDAV implementation in Yaws web server 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.


Affected software

Yaws
Arch Linux
Ubuntu
yaws (Debian package)
erlang-yapp (Ubuntu package)
erlang-yaws (Ubuntu package)
yaws (Ubuntu package)
yaws-mail (Ubuntu package)

How to mitigate CVE-2020-24379

Install updates from vendor's website.

Yaws - update to 2.0.8
yaws (Debian package) - update to 2.0.6+dfsg-1+deb10u1
erlang-yapp (Ubuntu package) - update to 2.0.4+dfsg-2ubuntu0.1
erlang-yaws (Ubuntu package) - update to 2.0.4+dfsg-2ubuntu0.1
yaws (Ubuntu package) - update to 2.0.4+dfsg-2ubuntu0.1
yaws-mail (Ubuntu package) - update to 2.0.4+dfsg-2ubuntu0.1

External References

Related Security Bulletins