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CVE Record

CVE-2018-1000544: rubyzip gem rubyzip version 1.2.1 and earlier contains a Directory Traversal vulnerability in Zip::File com...

rubyzip gem rubyzip version 1.2.1 and earlier contains a Directory Traversal vulnerability in Zip::File component that can result in write arbitrary files to the filesystem. This attack appear to be exploitable via If a site allows uploading of .zip files , an attacker can upload a malicious file that contains symlinks or files with absolute pathnames "../" to write arbitrary files to the filesystem..

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-1000544 is a directory traversal flaw in rubyzip 1.2.1 and earlier. If an application accepts and extracts untrusted ZIP uploads, a crafted archive could cause files to be written outside the intended extraction directory, potentially overwriting sensitive application or system files.

Executive priority

Prioritize systems that accept ZIP uploads or automated archive imports. The issue can become business-critical when extraction runs with permissions to modify application files, configuration, web roots, or scheduled-job locations.

Technical view

The rubyzip Zip::File component mishandles archive entries containing symlinks or absolute/parent-directory pathnames. Sources describe the impact as arbitrary filesystem writes during ZIP extraction. The bundle does not provide CVSS, CWE, proof of exploitation, or a single upstream fixed version.

Likely exposure

Exposure is most likely in Ruby applications or packaged products using rubyzip 1.2.1 or earlier to process ZIP files from users, partners, email, imports, or automation pipelines.

Exploitation context

The source bundle says exploitation requires a site or workflow that allows ZIP upload or processing. CISA KEV is false, and the provided sources do not state active exploitation in the wild.

Researcher notes

Evidence is strong for affected component and impact, but incomplete for scoring and exact upstream remediation. Treat the provided Red Hat and Debian advisories as distribution-specific confirmation, and avoid claiming exploitation without additional cited evidence.

Mitigation direction

  • Inventory Ruby applications and packaged dependencies for rubyzip 1.2.1 or earlier.
  • Apply vendor or distribution updates from trusted package channels.
  • Review upstream rubyzip guidance before choosing replacement versions or backports.
  • Disable or restrict untrusted ZIP extraction where updates cannot be applied quickly.
  • Run extraction with least filesystem privileges and isolated working directories.

Validation and detection

  • Search dependency manifests and lockfiles for rubyzip or ruby-zip versions.
  • Identify routes, jobs, or import pipelines that accept ZIP archives.
  • Confirm patched packages from Red Hat, Debian, or your Ruby dependency source.
  • Review extraction code for path normalization and destination-boundary checks.
  • Check whether ZIP processing runs with unnecessary write permissions.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2018-1000544 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.