CVE-2015-3246 (GCVE-0-2015-3246)
Vulnerability from cvelistv5 – Published: 2015-08-11 14:00 – Updated: 2026-08-27 03:56Summary
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)
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
12 references
| URL | Tags |
|---|---|
| http://www.securityfocus.com/bid/76022 | vdb-entryx_refsource_BID |
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| https://www.exploit-db.com/exploits/44633/ | exploitx_refsource_EXPLOIT-DB |
| https://access.redhat.com/articles/1537873 | x_refsource_CONFIRM |
| http://rhn.redhat.com/errata/RHSA-2015-1482.html | vendor-advisoryx_refsource_REDHAT |
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://www.qualys.com/2015/07/23/cve-2015-3245-c… | x_refsource_MISC |
| http://www.securitytracker.com/id/1033040 | vdb-entryx_refsource_SECTRACK |
| http://rhn.redhat.com/errata/RHSA-2015-1483.html | vendor-advisoryx_refsource_REDHAT |
| https://blog.talosintelligence.com/uat-10147-chin… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Date Public
2015-07-23 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 53718327-1fd6-4cac-98e7-b8b7062a9313
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
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
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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