PicoCTF_2017: Special Agent User

Category: Forensics Points: 50 Description:

We can get into the Administrator's computer with a browser exploit. But first, we need to figure out what browser they're using. Perhaps this information is located in a network packet capture we took: data.pcap. Enter the browser and version as "BrowserName BrowserVersion". NOTE: We're just looking for up to 3 levels of subversions for the browser version (ie. Version 1.2.3 for Version 1.2.3.4) and ignore any 0th subversions (ie. 1.2 for 1.2.0)

Hint:

Where can we find information on the browser in networking data? Maybe try reading up on user-agent strings.

Write-up

Looking in packet #93, we find the User-Agent(I get the reference)

Mozilla/5.0 (X11; OpenBSD i386) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36

Attempting to pass Mozilla 5.0, Safari 537.37 results as invalid flag but Chrome 36.0.1985 results in the correct flag.

Therefore, the flag is Chrome 36.0.1985.

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