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GHSA-w23q-4hw3-2pp6

HighCVSS 8.8 / 10
Published Sep 6, 2023·Last modified Feb 4, 2026
Affected Components(0)

No affected components available

Description

Impact

All users on Windows are impacted. MinIO fails to filter the \ character, which allows for arbitrary object placement across buckets. As a result, a user with low privileges, such as an access key, service account, or STS credential, which only has permission to PutObject in a specific bucket, can create an admin user.

Patches

There are two patches that fix this problem comprehensively

commit b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc
Author: Harshavardhana <harsha@minio.io>
Date:   Mon Mar 20 13:16:00 2023 -0700

    reject object names with '\' on windows (#16856)

commit 8d6558b23649f613414c8527b58973fbdfa4d1b8
Author: Harshavardhana <harsha@minio.io>
Date:   Mon Mar 20 00:35:25 2023 -0700

    fix: convert '\' to '/' on windows (#16852)

Workarounds

There are no known workarounds

References

The vulnerable code:

// minio/cmd/generic-handlers.go
// Check if the incoming path has bad path components,
// such as ".." and "."
// SlashSeparator -> /
// dotdotComponent -> ..
// dotComponent -> .
func hasBadPathComponent(path string) bool {
  path = strings.TrimSpace(path)
  for _, p := range strings.Split(path, SlashSeparator) {
    switch strings.TrimSpace(p) {
    case dotdotComponent:
      return true
    case dotComponent:
      return true
    }
  }
  return false
}
Risk Scores
Base Score
8.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
8.1

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.98%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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