github - ghsa-2c4f-vgwr-82q6

GHSA-2C4F-VGWR-82Q6

Vulnerability from github – Published: 2023-07-21 21:30 – Updated: 2024-04-04 06:18

Details

A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users.

Given this code is not in any released versions, no security releases have been issued.

Severity ?

3.1 (Low)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2023-3603"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476",
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-07-21T20:15:16Z",
    "severity": "MODERATE"
  },
  "details": "A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user\u0027s sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users.\n\nGiven this code is not in any released versions, no security releases have been issued.",
  "id": "GHSA-2c4f-vgwr-82q6",
  "modified": "2024-04-04T06:18:44Z",
  "published": "2023-07-21T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3603"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2023-3603"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2221791"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2023-3603 (GCVE-0-2023-3603)

Vulnerability from cvelistv5 – Published: 2023-07-21 19:09 – Updated: 2024-09-26 20:04

Summary

Severity ?

3.1 (Low)


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

CWE

CWE-476 - NULL Pointer Dereference

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/security/cve/CVE-2023-3603	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2221791	issue-trackingx_refsource_REDHAT

Impacted products

Vendor

Product

Version

n/a

libssh

Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Fedora	Extra Packages for Enterprise Linux 7
Fedora	Fedora

Credits

Upstream acknowledges Wei Chong Tan as the original reporter.

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          "lang": "en",
          "value": "The SFTP server implementation is based on callbacks so you can rewrite the sftp_channel_default_data_callback() to provide additional checks.\n\n[1] https://gitlab.com/libssh/libssh-mirror/-/blob/master/examples/sample_sftpserver.c#L330"
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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-2C4F-VGWR-82Q6

CVE-2023-3603 (GCVE-0-2023-3603)

Tags

Sightings

Nomenclature