buffer overflow – Shellcode using the Intel operation code 86_64 0x57 crashes

I am exploiting a buffer overflow in C to execute arbitrary code, but the shell code I am using is blocked when it finds the operation code 0x57.

The BOF is created by a scanf, which puts the entry in a buffer. My BOF already correctly modifies the instruction pointer so that it points to my buffer. The shell code, including a NOP sled, is also correctly placed in the memory.

This is the shell code I am using (from Shell Storm by Dad`):
x31 xc0 x48 xbb xd1 x9d x96 x91 xd0 x8c x97 xff x48 xf7 xdb x53 x54 x5f x99 x52 x57 x54 x5e xb0 x3b x0f x05

When executing it, it will say. Program received SIGILL signal, illegal instruction.
Using GDB, I followed byte by byte where it is blocked. It turned out to be in byte 0x57.

I'm doing this on a Linux x86_64 server.

If you have any idea how to solve the problem, leave a response. Any help is really appreciated!

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Drivers: How can I disable AMD radeon and use Intel Integrated Graphics in 2011 iMac?

I have an iMac from mid-2011, 27 inches. The graphics card has failed and the computer is locked randomly. This is a known problem, but it did not fail in time for Apple's replacement program. But I digress …

I would like to install Ubuntu on it and disable the broken AMD graphics card to be able to use the integrated Intel graphics. The output of

lspci | grep -E & # 39; VGA | Display & # 39;

It is as follows

00: 02.0 Display driver: Integrated graphics driver from the Intel 2nd Generation Core processor family (version 09)
01: 00.0 VGA compliant controller: Advanced Micro Devices, Inc. [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M]

Running lspci -k shows that the AMD device is using the & # 39; radeon & # 39; module, and the Intel device is using & # 39; i915 & # 39 ;. Therefore, I guess this means that both graphics devices are detected and have kernel drivers. (If I'm wrong, please let me know)

Therefore, I tried on the blacklist & # 39; radeon & # 39; in /etc/modprobe.d/blacklist.conf, but this causes the system to crash at startup. It is part of the way through the loading screen of the ubuntu logo, then the screen spits out some text and ends with the line "GNOME display manager started". (Sorry, I can not get a screenshot of the screen).

How should I proceed or how should I disable the dedicated graphics card and use the integrated Intel graphics?

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  • Low latency network
  • Up to 10 Gbit of bandwidth without meter possible!
  • 1 Gbit standard, possible upgrade to 10 Gbit
  • Bandwidth DEDICATED AND WITHOUT THUMB
  • Control panel to manage your servers.
  • 99.99% network SLA
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  • Free to choose the operating system
  • Including 100 Gbps DDoS protection
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Looking for a custom configuration? Send us an email to [email protected] And we will offer you a personalized offer with our best price.

The prices below are exclusive for WebHostingTalk members and the discount is applied at the time of payment.

Our offers

The servers below are base configurations. All servers are updatable in RAM, disk, bandwidth and port speed.

We can accommodate any configuration you require. Request a personalized quote >>

Intel Xeon CPU E3-1240v5 | 16GB DDR4 ECC RAM | SATA 240 GB SSD | 1Gbps uplink | Unmetered bandwidth | € 179 / month | Order now
Intel Xeon CPU E3-1230v6 | 16GB DDR4 ECC RAM | SATA 240 GB SSD | 1Gbps uplink | Unmetered bandwidth | € 179 / month | Order now
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See more configurations >>

Our support team is available at all times. Feel free to open a ticket or send us an email to [email protected]

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