Testing for backdoor access

Details of BNVL-2018-0057

What does the BNVL label mean?

BitNinja Server Security’s BNVL identifiers are intended for use to identify publicly known information security vulnerabilities in publicly released software packages. This project was designed to collect and analyze attack information from the BitNinja network after cluster analysis by the AI-powered Attack Vector Miner. More than 100 vulnerability types have been discovered with this project so far, so we decided to publish this platform to help to keep Linux server owners up-to-date.

Important! All listed BNVL vulnerabilities are protected by BitNinja PRO, so please check your configurations if your infrastructure is affected by any of them.

Syntax for BNVL labels:

BNVL prefix + Year + Arbitrary Digits

Name :
Testing for backdoor access
Related Links: Na



The attacker is trying to find a previously installed backdoor which was injected into exsiting files. The backdoor access is tested by trying to send a custom string and if the called file is infected, it will execute the provided php command and print the custom string.

Pattern: die(