UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root…
Priority LOW 25CWE-665Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.
Why it matters now
EPSS 0.00284 21st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:unrealircd:unrealircd:*:*:*:*:*:*:*:* | up to 4.0.13 | Vulnerable | UnrealIRCd |
- cpe:2.3:a:unrealircd:unrealircd:*:*:*:*:*:*:*:* Versions up to 4.0.13 Vulnerable ·UnrealIRCd
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-13649
- 2026-10-03 Alias added: GHSA-p387-c589-x473
References
More Unrealircd vulnerabilities
- TI-2010-01989 UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through… CVSS 2.0HIGH 7.5
- TI-2016-06143 The m_authenticate function in modules/m_sasl.c in UnrealIRCd before 3.2.10.7 and 4.x… CVSS 3.0HIGH 8.1
- TI-2023-27714 A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an… CVSS 3.1HIGH 7.5
- TI-2009-04649 Buffer overflow in UnrealIRCd 3.2beta11 through 3.2.8, when allow::options::noident is… CVSS 2.0MEDIUM 6.8
- TI-2013-06048 UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service… CVSS 2.0MEDIUM 5.0
- TI-2013-05367 Use-after-free vulnerability in UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2017-13649 · CVE Program
- CVE-2017-13649 · NVD
- FIRST EPSS
- GHSA-p387-c589-x473 · GitHub Advisory Database · CC BY 4.0
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