BMC Network Automation Session Hijacking

Credit: Filip Palian
Risk: Medium
Local: Yes
Remote: No

Intro: The BMC Network Automation allows authenticated users to hijack established remote sessions of other users, version v8.7.00.000 b383 u038 was confirmed to be vulnerable. Details: Authenticated users of the BMC Network Automation web application with assigned aviewera role are able to hijack SSH/Telnet sessions initiated by other, privileged users. In order to hijack an established session, the only requirement is to obtain a valid "terminalJobKey" of that session. A valid "terminalJobKey" can be obtained through enumeration of the possible values. This process is aided by the fact that the format of the "terminalJobKey" is known and newly generated values are sequential thus predictable. The format of a "terminalJobKey" was found to be DDDDDDDDD-DDDDDD, where "D" is a digit from 0-9 range. The vulnerable application was found to increment the value of "terminalJobKey" parameter by one (1) at the last position for each newly initiated remote session. Proof of Concept: 1. Privileged user initiates an SSH connection and a new terminal window is opened with the following sample URL, e.g.: https://host:9443//bca-networks/network/ 2. In the next step a non-privileged user enumerates "terminalJobKey" values until he finds a valid one and is able to hijack the already established session: https://host:9443//bca-networks/network/ https://host:9443//bca-networks/network/ https://host:9443//bca-networks/network/ https://host:9443//bca-networks/network/ Remediation: Contact vendor directly for remediation guidance. Timeline: 07.11.2018: Email detailing discovered issue sent to BMC at 08.11.2018: BMC confirms receipt of the report. 21.11.2018: Follow-up email sent to BMC asking for status. 10.12.2018: Follow-up email sent to BMC informing that the security advisory will be published in the next following weeks. 02.01.2019: The advisory has been released. Cheers, Filip Palian

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