GHSA-cr84-xvw4-qx3c

Опубликовано: 25 окт. 2022

Источник: github

Github: Прошло ревью

CVSS3: 7.5

Описание

Inefficient Regular Expression Complexity in shescape

Impact

This impacts users that use shescape to escape arguments:

for the Unix shell Bash, or any not-officially-supported Unix shell;
using the escape or escapeAll functions with the interpolation option set to true.

An attacker can cause polynomial backtracking in terms of the input string length due to a Regular Expression in shescape that is vulnerable to Regular Expression Denial of Service (ReDoS). Example:

import * as shescape from "shescape"; /* 1. Prerequisites */ const options = { interpolation: true, // and shell: "/bin/bash", // or shell: "some-not-officially-supported-shell", // or shell: undefined, // Only if the system's default shell is bash or an unsupported shell. }; /* 2. Attack */ let userInput = '{,'.repeat(150_000); // polynomial backtracking /* 3. Usage */ shescape.escape(userInput, options); // or shescape.escapeAll([userInput], options);

Patches

This bug has been patched in v1.6.1 which you can upgrade to now. No further changes required.

Workarounds

Alternatively, a maximum length can be enforced on input strings to shescape to reduce the impact of the vulnerability. It is not recommended to try and detect vulnerable input strings, as the logic for this may end up being vulnerable to ReDoS itself.

References

Shescape commit 552e8ea
Shescape Release v1.6.1

For more information

Comment on commit 552e8ea
Open an issue at https://github.com/ericcornelissen/shescape/issues (New issue > Question > Get started)

Ссылки

Пакеты

Наименование

shescape

npm

Затронутые версииВерсия исправления

>= 1.5.10, < 1.6.1

1.6.1

EPSS

Процентиль: 44%

0.00217

Низкий

7.5 High

CVSS3

CVE ID

CVE-2022-25918

Дефекты

CWE-1333

Связанные уязвимости

CVE-2022-25918

CVSS3: 5.3

nvd

больше 3 лет назад

The package shescape from 1.5.10 and before 1.6.1 are vulnerable to Regular Expression Denial of Service (ReDoS) via the escape function in index.js, due to the usage of insecure regex in the escapeArgBash function.

EPSS

Процентиль: 44%

0.00217

Низкий

7.5 High

CVSS3

CVE ID

CVE-2022-25918

Дефекты

CWE-1333