RUSTSEC-2019-0009

Double-free and use-after-free in SmallVec::grow()

Issued
Package
smallvec (crates.io)
Type
Vulnerability
Aliases
Details
https://github.com/servo/rust-smallvec/issues/148
Patched
  • >=0.6.10
Unaffected
  • <0.6.5
Keywords
  • double free
  • use after free
  • arbitrary code execution
Affected Functions
Version
smallvec::SmallVec::grow
  • <0.6.10, >=0.6.5

Description

Attempting to call grow on a spilled SmallVec with a value equal to the current capacity causes it to free the existing data. This performs a double free immediately and may lead to use-after-free on subsequent accesses to the SmallVec contents.

An attacker that controls the value passed to grow may exploit this flaw to obtain memory contents or gain remote code execution.

Credits to @ehuss for discovering, reporting and fixing the bug.

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