CVE-2015-3246 (GCVE-0-2015-3246)

Vulnerability from cvelistv5 – Published: 2015-08-11 14:00 – Updated: 2026-08-27 03:56
VLAI CISA Previdian
Summary
libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which allows local users to cause a denial of service (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined with CVE-2015-3245 to gain privileges.
Severity
5.1 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 00:00 UTC
CWE
  • n/a
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Date Public
2015-07-23 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 53718327-1fd6-4cac-98e7-b8b7062a9313

Vulnerability ID: CVE-2015-3246

Status: Confirmed

Status Updated: 2026-08-26 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-26
Asserted: 2026-08-26
Scope
Notes: Red Hat Libuser Race Condition Vulnerability | Affected: Red Hat / Libuser | Description: Red Hat libuser contains a race condition vulnerability that allows authenticated local users to corrupt the /etc/passwd file to cause a denial of service or privilege escalation. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-09 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://access.redhat.com/articles/1537873 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2015-3246
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes
Feed CISA Known Exploited Vulnerabilities Catalog
Product Libuser
Due Date 2026-09-09
Date Added 2026-08-26
Vendorproject Red Hat
Vulnerabilityname Red Hat Libuser Race Condition Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-08-26 18:00 UTC | Updated: 2026-08-26 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9b0d3a54-8baf-4ef3-93cb-fa7c04bd4425

Vulnerability ID: CVE-2015-3246

Status: Confirmed

Status Updated: 2026-08-26 17:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-26
Asserted: 2026-08-26
Scope
Notes: libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which... | Affected: null / libuser | CVSS: 5.1 (MEDIUM) | EPSS: 0.07092 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which...
Vendor null
Product libuser
Added Date 2026-08-26T17:00:09.897Z
Cvss Score 5.1
Epss Score 0.07092
Cvss Severity MEDIUM
Epss Percentile 0.93742
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-08-27 18:00 UTC | Updated: 2026-08-27 18:00 UTC
Show details on NVD website
To clipboard 

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      "initial_release_date": "2015-07-23T00:00:00+00:00",
      "product_status:fixed": "125",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libuser: Security flaw in handling /etc/passwd file",
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      "product_status:recommended": "3",
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      "status": "interim",
      "title": "SUSE CVE CVE-2015-3246",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-3246.json",
      "version": "7"
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.