RUSTSEC-2021-0027

Loading a bgzip block can write out of bounds if size overflows.

Issued
Package
bam (crates.io)
Type
Vulnerability
Categories
  • memory-corruption
Aliases
Details
https://gitlab.com/tprodanov/bam/-/issues/4
Patched
  • >=0.1.3
Affected Functions
Version
bam::bgzip::Block::load
  • <0.1.3

Description

Affected versions of bam set the length of an internal buffer using self.compressed.set_len(block_size - HEADER_SIZE - MIN_EXTRA_SIZE) and then wrote into it. While block_size was constrained to a proper maximum, when it was too small the subtraction could overflow negatively to a large number past the capacity of self.compressed.

This can result in memory corruption in the form of writing out of bounds when loading a bgzip file with a small block_size.

Commit 061eee38d4 fixed this issue by checking for the underflow when setting the buffer size.

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