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CVE-2020-37280— cbor-sync through 1.0.4 Memory Exhaustion via Unchecked CBOR Array Lengths

Quick assessment

Affected
PelionIoT cbor-sync
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.

cbor-sync 1.0.4 及更早版本中存在一个资源耗尽漏洞，位于 函数。该漏洞问题在于，它在解码 CBOR 数据时，直接信任声明的数组和映射长度，而没有验证剩余输入数据是否足够。远程攻击者可以通过构造一个极小的 CBOR 负载，在其中声明巨大的数组或映射长度，从而驱动数十亿次的迭代操作，最终耗尽 CPU 资源及进程的内存。

CVSS 7.5 · High EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
PelionIoT cbor-sync ≤ 1.0.4 affected
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I. Basic Information for CVE-2020-37280

Vulnerability Information
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Vulnerability Title
cbor-sync through 1.0.4 Memory Exhaustion via Unchecked CBOR Array Lengths
Source: CVE Program / CVE List V5
Vulnerability Description
cbor-sync through 1.0.4 contains a resource exhaustion vulnerability in CBOR.decode that trusts declared array and map lengths without checking remaining input. Remote attackers can supply a tiny crafted CBOR payload declaring huge lengths to drive billions of iterations, exhausting CPU and process memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PelionIoT cbor-sync 0 ~ 1.0.4 -

II. Public POCs for CVE-2020-37280

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III. Intelligence Information for CVE-2020-37280

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Patches & Fixes for CVE-2020-37280 (1)

Vendor Advisories for CVE-2020-37280 (1)

Proof of Concept for CVE-2020-37280 (1)

Other References for CVE-2020-37280 (1)

IV. Related Vulnerabilities

Same weakness: CWE-789

V. Comments for CVE-2020-37280

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