SysAdmins, who probably already have much on their plates at the end of the holiday season, have another rather urgent task at hand if they administer servers equipped with Intelligent Platform Management Interface (IPMI) cards. It seems that since November, black hat hackers have been using the cards to gain access in order to install JungleSecransomware that encrypts data and demands a 0.3 bitcoin payment (about $1,100 at the current rate) for the unlock key.

For the uninitiated, IPMI is a management interface that's either built into server motherboards or on add-on cards that provides management and monitoring capabilities that are independent of the system's CPU, firmware, and operating system. With it, admins can remotely manage a server to do things like power it up and down, monitor system information, access KVMs, and more. While this is useful for managing off-premises servers in colocation data centers and the like, it also offers an opening for attackers if it's not properly locked.

There's been a lot of uneven reporting on this since BleepingComputer broke the story on Dec. 26, with many sites indicating that the hack only affects linuxservers. While it's true that the majority of servers affected have been running Linux, windows as well as Mac servers have also fallen victim. At this point it's not clear whether Linux servers appear to be most affected simply because of Linux's dominance in the server market or because attackers are finding the attack easier to successfully manage when targeting Linux machines.

There have also been reports that the exploit only takes advantage of systems using default IPMI passwords, but BleepingComputer reported it had found at least one victim that had disabled the IPMI Admin user and was still hacked by an attacker that evidently gained access by taking advantage of a vulnerability that was most likely the result of IPMI not being configured properly.

Indeed, it appears at this point that poor configuration is how attackers are gaining entry.

The good news is that securing against such attacks should be rather straightforward, starting with making sure the IPMI password isn't the default. In addition, access control lists (ACLs) should be configured to specify the IP addresses that have access the IPMI interface, and to also configure IPMI to only listen on internal IP addresses, which would limit access to admins inside the organization's system.

For Linux servers, it might be a good idea to password protect the GRUB bootloader. After gaining access to Linux servers, attackers have been rebooting into single user mode to gain root access before downloading the malicious payload. At the very least, password protecting GRUB would make reboots difficult.

本文系统(linux)相关术语:linux系统 鸟哥的linux私房菜 linux命令大全 linux操作系统

代码区博客精选文章
分页:12
转载请注明
本文标题:Linux Servers Appear Most Affected by IPMI Enabled JungleSec Ransomware Attacks
本站链接:https://www.codesec.net/view/628075.html


1.凡CodeSecTeam转载的文章,均出自其它媒体或其他官网介绍,目的在于传递更多的信息,并不代表本站赞同其观点和其真实性负责;
2.转载的文章仅代表原创作者观点,与本站无关。其原创性以及文中陈述文字和内容未经本站证实,本站对该文以及其中全部或者部分内容、文字的真实性、完整性、及时性,不作出任何保证或承若;
3.如本站转载稿涉及版权等问题,请作者及时联系本站,我们会及时处理。
登录后可拥有收藏文章、关注作者等权限...
技术大类 技术大类 | 系统(linux) | 评论(0) | 阅读(33)