{"id":37292,"date":"2019-10-31T22:16:49","date_gmt":"2019-10-31T19:16:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root\/"},"modified":"2019-10-31T22:16:49","modified_gmt":"2019-10-31T19:16:49","slug":"v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"A backdoor found in Webmin allows remote access with root privileges","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In the package Webmin<\/a><\/noindex>, which provides tools for remote server management, detected<\/a><\/noindex> a backdoor (CVE-2019-15107<\/a><\/noindex>), discovered in the official builds of the project, distributed<\/a><\/noindex> through Sourceforge and recommended<\/a><\/noindex> on the main site. The backdoor was present in builds from 1.882 to 1.921 inclusive (the code with the backdoor was not in the git repository) and allowed arbitrary shell commands to be executed in the system with root privileges without authentication. <\/p>\n

For an attack, it is sufficient to have an open network port with Webmin and activity in the web interface of the outdated password change function (enabled by default in builds 1.890, but disabled in other versions). The issue has been closed<\/a><\/noindex> downward API support (simultaneously with this in the official blog says nothing about release dates, but the creators shared gameplay fragments from a new demo intended for internal testing.<\/a><\/noindex> 1,930. As a temporary measure to block the backdoor, it is sufficient to remove the setting 'passwd_mode=' from the configuration file \/etc\/webmin\/miniserv.conf. A test has been prepared exploit prototype<\/a><\/noindex>.<\/p>\n

The issue was detected<\/a><\/noindex> in the script password_change.cgi, in which the function unix_crypt is called to check the old password entered in the web form a layer<\/a><\/noindex> with the received user password passed to it without escaping special characters. In the git repository, this function is<\/a><\/noindex> that wraps around the Crypt::UnixCrypt module and poses no danger, but in the archive with code provided on the Sourceforge site, there is code that directly accesses \/etc\/shadow, doing so using shell constructs. To exploit this, it is enough to enter the character '|' in the old password field, and the code following it will be executed with root privileges on the server.<\/p>\n

According to statement<\/a><\/noindex> Webmin developers, the malicious code was inserted as a result of compromising the project's infrastructure. Details are not yet disclosed, so it is unclear whether the hack was limited to seizing control of the account on Sourceforge or affected other elements of the Webmin development and build infrastructure. The malicious code was present in the archives since March 2018. The issue also affected Usermin builds<\/a><\/noindex>. All bootable archives have now been rebuilt from Git.<\/p>\n

<\/a><\/noindex><\/p>\n

Source: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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