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December 21, 2015 02:00 pm

Juniper's Backdoor Password Disclosed, Likely Added In Late 2013

itwbennett writes: In a blog post on Rapid7's community portal Sunday, HD Moore posted some notes on the Juniper ScreenOS incident, notably that his team discovered the backdoor password that enables the Telnet and SSH bypass. Quoting: "Although most folks are more familiar with x86 than ARM, the ARM binaries are significantly easier to compare due to minimal changes in the compiler output. ... Once the binary is loaded, it helps to identify and tag common functions. Searching for the text "strcmp" finds a static string that is referenced in the sub_ED7D94 function. Looking at the strings output, we can see some interesting string references, including auth_admin_ssh_special and auth_admin_internal. ... The argument to the strcmp call is <<< %s(un='%s') = %u, which is the backdoor password, and was presumably chosen so that it would be mistaken for one of the many other debug format strings in the code. This password allows an attacker to bypass authentication through SSH and Telnet, as long as they know a valid username. If you want to test this issue by hand, telnet or ssh to a Netscreen device, specify a valid username, and the backdoor password. If the device is vulnerable, you should receive an interactive shell with the highest privileges."

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