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Snf's blog ·

Coinspect OP CHECKSIG challenge. The challenge from Coinspect. Consisted in taking the bitcoins from a multisig or p2sh (pay to script hash) wallet: https:/ blockchain.info/address/32GkPB9XjMAELR4Q2Hr31Jdz2tntY18zCe. I’m making this post as short as possible, and for understanding it, you may need previous knowledge about bitcoin internals. Understanding OP CHECKSIG opcode. This is a fuzzy and complicated part of validating bitcoin transactions. It’s explained here. Bug in SIGHASH SINGLE. This mode is su...

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Coinspect OP CHECKSIG challenge. The challenge from Coinspect. Consisted in taking the bitcoins from a multisig or p2sh (pay to script hash) wallet: https:/ blockchain.info/address/32GkPB9XjMAELR4Q2Hr31Jdz2tntY18zCe. I’m making this post as short as possible, and for understanding it, you may need previous knowledge about bitcoin internals. Understanding OP CHECKSIG opcode. This is a fuzzy and complicated part of validating bitcoin transactions. It’s explained here. Bug in SIGHASH SINGLE. This mode is su...

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Snf's blog · | snf.github.io Reviews

https://snf.github.io

Coinspect OP CHECKSIG challenge. The challenge from Coinspect. Consisted in taking the bitcoins from a multisig or p2sh (pay to script hash) wallet: https:/ blockchain.info/address/32GkPB9XjMAELR4Q2Hr31Jdz2tntY18zCe. I’m making this post as short as possible, and for understanding it, you may need previous knowledge about bitcoin internals. Understanding OP CHECKSIG opcode. This is a fuzzy and complicated part of validating bitcoin transactions. It’s explained here. Bug in SIGHASH SINGLE. This mode is su...

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snf.github.io

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Snf's blog ·

http://snf.github.io/page2

Process continuation after exploit (aka. IE is my process launcher). This is an old post from one of my old blogs so reposting here for eternity (not one of the most elegant teks, looking at you Seba from the past). The trigger for the bug is:. Table style="position: absolute; clip: rect(0);". When we trigger the bug we see that we are using a defaced vtable, in my IE, i see that the jump comes from. 0:000 ub 7dcb1c3f mshtml! When trying to set a flag on a miscalculated address. The main idea of autoreco...

2

About · Snf's blog

http://snf.github.io/about

This is Sebastian Fernandez's blog. I write about challenges and security, not a great writer, so not great stories but plenty of technical details. I hack and program, enjoy breaking stuff and learning and writing in safe languages like F#, Ocaml and Rust. Tweet me: https:/ twitter.com/snfernandez. Code: https:/ github.com/snf.

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Archive · Snf's blog

http://snf.github.io/archive

06 Aug 2014 Coinspect OP CHECKSIG challenge. 15 Nov 2010 Process continuation after exploit (aka. IE is my process launcher).

4

Coinspect OP_CHECKSIG challenge · Snf's blog

http://snf.github.io/2014/08/06/coinspect-op_checksig-challenge

Coinspect OP CHECKSIG challenge. The challenge from Coinspect. Consisted in taking the bitcoins from a multisig or p2sh (pay to script hash) wallet: https:/ blockchain.info/address/32GkPB9XjMAELR4Q2Hr31Jdz2tntY18zCe. I’m making this post as short as possible, and for understanding it, you may need previous knowledge about bitcoin internals. Understanding OP CHECKSIG opcode. This is a fuzzy and complicated part of validating bitcoin transactions. It’s explained here. Bug in SIGHASH SINGLE. This mode is su...

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Coinspect OP CHECKSIG challenge. The challenge from Coinspect. Consisted in taking the bitcoins from a multisig or p2sh (pay to script hash) wallet: https:/ blockchain.info/address/32GkPB9XjMAELR4Q2Hr31Jdz2tntY18zCe. I’m making this post as short as possible, and for understanding it, you may need previous knowledge about bitcoin internals. Understanding OP CHECKSIG opcode. This is a fuzzy and complicated part of validating bitcoin transactions. It’s explained here. Bug in SIGHASH SINGLE. This mode is su...

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