CVE-2020-15254 Undefined Behavior in bounded Crossbeam channel

2020-10-1617:05:24

CWE-119

GitHub_M

www.cve.org

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

9.4 High

AI Score

Confidence

High

0.007 Low

EPSS

Percentile

80.4%

JSON

Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the bounded channel incorrectly assumes that Vec::from_iter has allocated capacity that same as the number of iterator elements. Vec::from_iter does not actually guarantee that and may allocate extra memory. The destructor of the bounded channel reconstructs Vec from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when Vec::from_iter has allocated different sizes with the number of iterator elements. This has been fixed in crossbeam-channel 0.4.4.

CNA Affected

[
  {
    "product": "crossbeam",
    "vendor": "crossbeam-rs",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.4.4"
      }
    ]
  }
]