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AUSCERT External Security Bulletin Redistribution
USN-4569-1: Yaws vulnerabilities
6 October 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-24916 CVE-2020-24379
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USN-4569-1: Yaws vulnerabilities
05 October 2020
Several security issues were fixed in Yaws.
o Ubuntu 18.04 LTS
o yaws - High performance HTTP 1.1 webserver written in Erlang
It was discovered that Yaws did not properly sanitize XML input. A remote
attacker could use this vulnerability to execute an XML External Entity
(XXE) injection attack. (CVE-2020-24379)
It was discovered that Yaws mishandled certain input when running CGI
scripts. A remote attacker could use this vulnerability to execute
arbitrary commands. (CVE-2020-24916)
The problem can be corrected by updating your system to the following package
o erlang-yapp - 2.0.4+dfsg-2ubuntu0.1
o erlang-yaws - 2.0.4+dfsg-2ubuntu0.1
o yaws - 2.0.4+dfsg-2ubuntu0.1
o yaws-mail - 2.0.4+dfsg-2ubuntu0.1
In general, a standard system update will make all the necessary changes.
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