HistoryEdit

RUSTSEC-2021-0048

StackVec::extend can write out of bounds when size_hint is incorrect

Issued
Package
stackvector (crates.io)
Type
Vulnerability
Categories
Aliases
Details
https://github.com/Alexhuszagh/rust-stackvector/issues/2
CVSS Score
7.3 HIGH
CVSS Details
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Patched
  • >=1.0.9

Description

StackVec::extend used the lower and upper bounds from an Iterator's size_hint to determine how many items to push into the stack based vector.

If the size_hint implementation returned a lower bound that was larger than the upper bound, StackVec would write out of bounds and overwrite memory on the stack. As mentioned by the size_hint documentation, size_hint is mainly for optimization and incorrect implementations should not lead to memory safety issues.