HistoryEditJSON (OSV)

RUSTSEC-2019-0008

Flaw in string parsing can lead to crashes due to invalid memory access.

Reported
Issued
Package
simd-json (crates.io)
Type
Vulnerability
Keywords
#simd
Aliases
References
CVSS Score
7.5 HIGH
CVSS Details
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Patched
  • >=0.1.15
Unaffected
  • <=0.1.13
Affected Architectures
  • x86
  • x86_64

Description

The affected version of this crate did not guard against accessing memory beyond the range of its input data. A pointer cast to read the data into a 256-bit register could lead to a segmentation fault when the end plus the 32 bytes (256 bit) read would overlap into the next page during string parsing.

page   |  ...  page 1  ...  | ... page 2  ... |
data   | x[n * 32 byte]xx__ |                 |
access | ..][ 32 byte ]     |                 |
segflt |               [ 32 | byte ]          |

This allows an attacker to eventually crash a service.

The flaw was corrected by using a padding buffer for the last read from the input. So that we are we never read over the boundary of the input data.

Advisory available under CC0-1.0 license.