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CVE-2023-52557— OpenBSD 7.3 invalid l2tp message npppd crash

Quick assessment

Affected
OpenBSD OpenBSD
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.

OpenBSD是加拿大OpenBSD项目组的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 7.3 errata 016之前版本存在安全漏洞，该漏洞源于包含长度错误的 AVP的 l2tp消息，导致崩溃。

AI Predicted 5.3 Difficulty: Easy EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-52557

Vulnerability Information
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Vulnerability Title
OpenBSD 7.3 invalid l2tp message npppd crash
Source: CVE Program / CVE List V5
Vulnerability Description
In OpenBSD 7.3 before errata 016, npppd(8) could crash by a l2tp message which has an AVP (Attribute-Value Pair) with wrong length.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD项目组的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 7.3 errata 016之前版本存在安全漏洞，该漏洞源于包含长度错误的 AVP的 l2tp消息，导致崩溃。
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
OpenBSD OpenBSD 7.3 ~ 7.3 errata 016 -

II. Public POCs for CVE-2023-52557

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III. Intelligence Information for CVE-2023-52557

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Patches & Fixes for CVE-2023-52557 (1)

Same Patch Batch · OpenBSD · 2024-03-01 · 3 CVEs total

CVE-2023-52556 OpenBSD 7.4 pf state race condition kernel crash
CVE-2023-52558 OpenBSD 7.4 and 7.3 m_split() network buffer kernel crash

IV. Related Vulnerabilities

Same product: OpenBSD
Same vendor: OpenBSD
Same weakness: CWE-131

V. Comments for CVE-2023-52557

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