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CVE-2020-15254— Undefined Behavior in bounded Crossbeam channel

Quick assessment

Affected
crossbeam-rs crossbeam
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Crossbeam是个人开发者的一个应用于并发编程的工具。 Crossbeam crossbeam-channel 0.4.4之前版本存在缓冲区错误漏洞，该漏洞源于Vec::from iter分配内存与迭代器数量不一致。

CVSS 8.1 · High EPSS 2.70% · P86
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I. Basic Information for CVE-2020-15254

Vulnerability Information
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Vulnerability Title
Undefined Behavior in bounded Crossbeam channel
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Crossbeam 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Crossbeam是个人开发者的一个应用于并发编程的工具。 Crossbeam crossbeam-channel 0.4.4之前版本存在缓冲区错误漏洞，该漏洞源于Vec::from iter分配内存与迭代器数量不一致。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
crossbeam-rs crossbeam < 0.4.4 -

II. Public POCs for CVE-2020-15254

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III. Intelligence Information for CVE-2020-15254

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Patches & Fixes for CVE-2020-15254 (2)

Vendor Advisories for CVE-2020-15254 (1)

Other References for CVE-2020-15254 (1)

IV. Related Vulnerabilities

Same product: crossbeam
Same vendor: crossbeam-rs
Same weakness: CWE-119

V. Comments for CVE-2020-15254

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