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CVE-2022-31100— Reachable Assertion in rulex

Quick assessment

Affected
rulex-rs rulex
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.

rulex是rulex开源的一种新的、可移植的正则表达式语言。 rulex 0.4.3 之前版本存在安全漏洞，该漏洞源于解析不受信任的 rulex 表达式时，rulex 可能会崩溃，可能会导致拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.86% · P56

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-31100

Vulnerability Information
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Vulnerability Title
Reachable Assertion in rulex
Source: CVE Program / CVE List V5
Vulnerability Description
rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result. This is a security concern for you, if your service parses untrusted rulex expressions (expressions provided by an untrusted user), and your service becomes unavailable when the thread running rulex panics. The crashes are fixed in version **0.4.3**. Affected users are advised to update to this version. The only known workaround for this issue is to assume that regular expression parsing will panic and to add logic to catch panics.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
rulex 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rulex是rulex开源的一种新的、可移植的正则表达式语言。 rulex 0.4.3 之前版本存在安全漏洞，该漏洞源于解析不受信任的 rulex 表达式时，rulex 可能会崩溃，可能会导致拒绝服务攻击。
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
rulex-rs rulex < 0.4.3 -

II. Public POCs for CVE-2022-31100

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III. Intelligence Information for CVE-2022-31100

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Patches & Fixes for CVE-2022-31100 (1)

Vendor Advisories for CVE-2022-31100 (1)

IV. Related Vulnerabilities

Same product: rulex
Same vendor: rulex-rs
Same weakness: CWE-617

V. Comments for CVE-2022-31100

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