Home/CVE/WinRAR Absolute Path Traversal Vulnerability
CVE

CVE-2018-20250

WinRAR Absolute Path Traversal Vulnerability

In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.

HIGH · CVSS 7.8 ⚠ CISA KEV EPSS 0.93462 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules14 YARA rules0

Required Remediation

Apply updates per vendor instructions.

Threat Actors Linked

8
actorAPT33
actorOilRig
actorAPT39
actorBitter

Affected Products & Versions

1

Sigma Hunt Rules

14
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighWinRAR Creating Files in Startup Locations
productmediumWinRAR Execution in Non-Standard Folder
productmediumPotentially Suspicious Child Process Of WinRAR.EXE
productmediumWinrar Compressing Dump Files
relatedcriticalBitbucket Unauthorized Full Data Export Triggered
relatedcriticalBitbucket Unauthorized Access To A Resource

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · cve@checkpoint.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Feb 2019 · 08:29 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

Vendor Advisories

1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/106948Broken LinkThird Party AdvisoryVDB Entry
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