Vulnerability-Lookup

GHSA-7M8F-JJ48-X349

Vulnerability from github – Published: 2024-05-21 18:31 – Updated: 2024-11-06 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

When vfs_getattr_nosec() calls a filesystem's getattr interface function then the 'nosec' should propagate into this function so that vfs_getattr_nosec() can again be called from the filesystem's gettattr rather than vfs_getattr(). The latter would add unnecessary security checks that the initial vfs_getattr_nosec() call wanted to avoid. Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass with the new getattr_flags parameter to the getattr interface function. In overlayfs and ecryptfs use this flag to determine which one of the two functions to call.

In a recent code change introduced to IMA vfs_getattr_nosec() ended up calling vfs_getattr() in overlayfs, which in turn called security_inode_getattr() on an exiting process that did not have current->fs set anymore, which then caused a kernel NULL pointer dereference. With this change the call to security_inode_getattr() can be avoided, thus avoiding the NULL pointer dereference.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2023-52779"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T16:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\n\nWhen vfs_getattr_nosec() calls a filesystem\u0027s getattr interface function\nthen the \u0027nosec\u0027 should propagate into this function so that\nvfs_getattr_nosec() can again be called from the filesystem\u0027s gettattr\nrather than vfs_getattr(). The latter would add unnecessary security\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\nwith the new getattr_flags parameter to the getattr interface function.\nIn overlayfs and ecryptfs use this flag to determine which one of the\ntwo functions to call.\n\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\ncalling vfs_getattr() in overlayfs, which in turn called\nsecurity_inode_getattr() on an exiting process that did not have\ncurrent-\u003efs set anymore, which then caused a kernel NULL pointer\ndereference. With this change the call to security_inode_getattr() can\nbe avoided, thus avoiding the NULL pointer dereference.",
  "id": "GHSA-7m8f-jj48-x349",
  "modified": "2024-11-06T18:31:04Z",
  "published": "2024-05-21T18:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52779"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
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}

CVE-2023-52779 (GCVE-0-2023-52779)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:30 – Updated: 2026-05-11 19:32

Title

fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

Summary

In the Linux kernel, the following vulnerability has been resolved: fs: Pass AT_GETATTR_NOSEC flag to getattr interface function When vfs_getattr_nosec() calls a filesystem's getattr interface function then the 'nosec' should propagate into this function so that vfs_getattr_nosec() can again be called from the filesystem's gettattr rather than vfs_getattr(). The latter would add unnecessary security checks that the initial vfs_getattr_nosec() call wanted to avoid. Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass with the new getattr_flags parameter to the getattr interface function. In overlayfs and ecryptfs use this flag to determine which one of the two functions to call. In a recent code change introduced to IMA vfs_getattr_nosec() ended up calling vfs_getattr() in overlayfs, which in turn called security_inode_getattr() on an exiting process that did not have current->fs set anymore, which then caused a kernel NULL pointer dereference. With this change the call to security_inode_getattr() can be avoided, thus avoiding the NULL pointer dereference.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-29 18:48 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/3fb0fa08641903304…
https://git.kernel.org/stable/c/8a924db2d7b5eb69b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7 , < 3fb0fa08641903304b9d81d52a379ff031dc41d4 (git) Affected: db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7 , < 8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf (git)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.6.4 , ≤ 6.6.* (semver) Unaffected: 6.7 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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