CVE-2022-30636: Limited directory traversal vulnerability on Windows in golang.org/x/crypto

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-02 · updated 2026-06-17

Description

httpTokenCacheKey uses path.Base to extract the expected HTTP-01 token value to lookup in the DirCache implementation. On Windows, path.Base acts differently to filepath.Base, since Windows uses a different path separator (\ vs. /), allowing a user to provide a relative path, i.e. .well-known/acme-challenge/..\..\asd becomes ..\..\asd. The extracted path is then suffixed with +http-01, joined with the cache directory, and opened. Since the controlled path is suffixed with +http-01 before opening, the impact of this is significantly limited, since it only allows reading arbitrary files on the system if and only if they have this suffix.

Affected products

golang.org/x/crypto/ssh: before 0.0.0-20220525230936-793ad666bf5e — fixed in 0.0.0-20220525230936-793ad666bf5e
Golang.Org/X/Crypto: before 0.0.0-20220525230936-793ad666bf5e — fixed in 0.0.0-20220525230936-793ad666bf5e

How to fix

Upgrade to a fixed version: golang.org/x/crypto/ssh 0.0.0-20220525230936-793ad666bf5e; Golang.Org/X/Crypto 0.0.0-20220525230936-793ad666bf5e. Check the vendor advisory for mitigations.

References

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