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9frontCVELIST:CVE-2024-8158

HistoryAug 25, 2024 - 9:31 p.m.

CVE-2024-8158 User impersonation for lib9p based 9p fileservers

2024-08-2521:31:08

CWE-639

9front

www.cve.org

9p fileservers

user impersonation

authentication implementation

9front systems

CVSS4

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/SC:H/VI:H/SI:H/VA:N/SA:N/AU:N/U:Red/V:C/RE:L

EPSS

0.001

Percentile

16.8%

JSON

A bug in the 9p authentication implementation within lib9p allows an attacker with an existing valid user within the configured auth server to impersonate any other valid filesystem user.

This is due to lib9p not properly verifying that the uname given in the Tauth and Tattach 9p messages matches the client UID returned from the factotum authentication handshake.

The only filesystem making use of these functions within the base 9front systems is the experimental hjfs disk filesystem, other disk filesystems (cwfs and gefs) are not affected by this bug.

This bug was inherited from Plan 9 and is present in all versions of 9front and is remedied fully in commit 9645ae07eb66a59015e3e118d0024790c37400da.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "modules": [
      "lib9p",
      "hjfs"
    ],
    "product": "9front",
    "repo": "http://git.9front.org/plan9front/plan9front/HEAD/info.html",
    "vendor": "9front",
    "versions": [
      {
        "lessThan": "9645ae07eb66a59015e3e118d0024790c37400da",
        "status": "affected",
        "version": "0",
        "versionType": "Commit Hash"
      }
    ]
  }
]

References

git.9front.org/plan9front/plan9front/07aa9bfeef55ca987d411115adcfbbd4390ecf34/commit.html