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Merge pull request #700 from JOE1994/0110-libp2p-deflate

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libp2p-deflate: Undefined data exposed in DeflateOutput's AsyncRead implementation
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Sergey "Shnatsel" Davidoff
2021-01-27 17:03:04 +01:00
committed by GitHub
parent f48660ee6c 0788bf440f
commit 10062201a1
1 changed files with 20 additions and 0 deletions
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crates/libp2p-deflate/RUSTSEC-0000-0000.md Normal file
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "libp2p-deflate"
date = "2020-01-24"
url = "https://github.com/libp2p/rust-libp2p/issues/1932"
categories = ["memory-exposure"]
[versions]
patched = [">= 0.27.1"]
```
# Contents of uninitialized memory exposed in DeflateOutput's AsyncRead implementation
Affected versions of this crate passes an uninitialized buffer to a user-provided trait function `AsyncRead::poll_read()`.
Arbitrary `AsyncRead::poll_read()` implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer.
Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.
The flaw was fixed in commit 5ba266a by ensuring the newly allocated part of the buffer is zero-initialized before passing it to a user-provided `AsyncRead::poll_read()`.