CVE-2025-53623 Overview
CVE-2025-53623 is an arbitrary code execution vulnerability in the Shopify job-iteration gem, an extension for ActiveJob that makes Ruby on Rails jobs interruptible and resumable. The flaw resides in the CsvEnumerator class in versions prior to 1.11.0. Attackers can exploit the count_of_rows_in_file method when it processes untrusted CSV filenames, leading to OS command injection [CWE-78]. Successful exploitation grants attackers the ability to execute arbitrary commands on the host running the application, enabling unauthorized access, data exfiltration, or full system compromise. The maintainers fixed the issue in version 1.11.0.
Critical Impact
Unauthenticated attackers can achieve remote code execution by supplying crafted CSV file paths to applications using vulnerable versions of the job-iteration gem.
Affected Products
- Shopify job-iteration gem versions prior to 1.11.0
- Ruby on Rails applications using ActiveJob with the vulnerable CsvEnumerator class
- Background job workers processing untrusted CSV file paths via count_of_rows_in_file
Discovery Timeline
- 2025-07-14 - CVE-2025-53623 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-53623
Vulnerability Analysis
The job-iteration gem provides enumerator classes that allow ActiveJob workers to process large datasets in resumable chunks. The CsvEnumerator class accepts CSV file paths and exposes the count_of_rows_in_file method to determine job progress and chunking. The method passes filename input to a shell-invoking system utility without proper sanitization. When an application allows untrusted input to flow into this method, attackers can inject shell metacharacters into the filename argument. The injected payload executes in the context of the Ruby worker process, inheriting its privileges and access to application secrets, databases, and internal services.
Root Cause
The root cause is improper neutralization of special elements used in an OS command [CWE-78]. The CsvEnumerator implementation delegated row counting to an external command and concatenated the user-supplied file path into the command string. Shell metacharacters such as backticks, semicolons, and pipes were not escaped or validated, allowing arbitrary command execution rather than treating the input strictly as a file path argument.
Attack Vector
The attack vector is network-accessible when applications expose endpoints or workflows that enqueue jobs using attacker-influenced CSV file paths. For example, a web application that lets users upload CSVs, specify import filenames, or trigger background imports through an API can forward the malicious path into a CsvEnumerator instance. The vulnerability requires no authentication or user interaction in scenarios where the file path field is exposed to anonymous users. See the GitHub Security Advisory GHSA-6qjf-g333-pv38 and the fix commit for technical details.
Detection Methods for CVE-2025-53623
Indicators of Compromise
- Unexpected child processes spawned by Ruby worker processes such as sidekiq, resque, or puma, particularly shells like sh, bash, or utilities like wc, curl, or wget.
- CSV filename arguments in application logs containing shell metacharacters such as ;, |, `, $(, or &&.
- Outbound network connections from background worker hosts to unfamiliar IP addresses immediately after CSV processing jobs run.
Detection Strategies
- Audit application code and dependency manifests (Gemfile.lock) for job-iteration versions below 1.11.0.
- Inspect runtime telemetry for command-line patterns where Ruby processes invoke /bin/sh -c with file path arguments containing shell metacharacters.
- Review job queues and parameters for CSV path values originating from HTTP request bodies, query strings, or third-party integrations.
Monitoring Recommendations
- Enable EDR process-tree monitoring on hosts running Rails background workers to flag anomalous shell invocations from Ruby parents.
- Alert on file-path parameters submitted to job enqueue endpoints that contain non-alphanumeric characters beyond standard path separators.
- Capture and centralize ActiveJob logs to correlate job arguments with subsequent process and network events.
How to Mitigate CVE-2025-53623
Immediate Actions Required
- Upgrade the job-iteration gem to version 1.11.0 or later in all Ruby on Rails applications.
- Audit application code for calls to CsvEnumerator.new and count_of_rows_in_file that accept user-controlled file paths.
- Rotate credentials, API keys, and tokens accessible to worker processes if exploitation is suspected.
Patch Information
Shopify resolved the vulnerability in job-iteration version 1.11.0. The fix is available in the v1.11.0 release and was introduced in pull request #595. Update the dependency in Gemfile and run bundle update job-iteration to apply the patched version.
Workarounds
- Avoid passing untrusted or user-supplied input to the CsvEnumerator class until the patch is applied.
- Sanitize and validate CSV file paths against an allowlist of known directories and filenames before passing them to enumerator methods.
- Refrain from calling count_of_rows_in_file with attacker-influenced filenames; substitute internal row-counting logic where possible.
# Configuration example: pin patched version in Gemfile
gem 'job-iteration', '>= 1.11.0'
# Apply the update
bundle update job-iteration
# Verify installed version
bundle info job-iteration | grep -i version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
