github - ghsa-jcxc-5f87-vq5m

GHSA-JCXC-5F87-VQ5M

Vulnerability from github – Published: 2022-05-24 17:02 – Updated: 2025-06-09 18:32

Details

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.

Severity ?

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2019-18276"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-273"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-11-28T01:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support \"saved UID\" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use \"enable -f\" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.",
  "id": "GHSA-jcxc-5f87-vq5m",
  "modified": "2025-06-09T18:32:00Z",
  "published": "2022-05-24T17:02:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18276"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E"
    },
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    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202105-34"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20200430-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "type": "WEB",
      "url": "https://www.youtube.com/watch?v=-wGtxJ8opa8"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html"
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  "severity": [
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      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
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}

CVE-2019-18276 (GCVE-0-2019-18276)

Vulnerability from cvelistv5 – Published: 2019-11-28 00:27 – Updated: 2025-06-09 15:51

Summary

Severity ?

7.8 (High)


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

CWE

Assigner

mitre

References

URL

Tags

	https://lists.apache.org/thread.html/rf9fa47ab664…	mailing-listx_refsource_MLIST
	https://security.gentoo.org/glsa/202105-34	vendor-advisoryx_refsource_GENTOO
	https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
	https://www.youtube.com/watch?v=-wGtxJ8opa8	x_refsource_MISC
	https://github.com/bminor/bash/commit/951bdaad7a1…	x_refsource_CONFIRM
	http://packetstormsecurity.com/files/155498/Bash-…	x_refsource_MISC
	https://security.netapp.com/advisory/ntap-2020043…	x_refsource_CONFIRM

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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-JCXC-5F87-VQ5M

CVE-2019-18276 (GCVE-0-2019-18276)

Tags

Sightings

Nomenclature