IBM Aspera Faspex YAML Deserialization Remote Code Execution Vulnerability Advisory (CVE-2022-47986)
Executive & SecOps Summary
SECOPS ASSESSMENTIBM Aspera Faspex 4.4.2 Patch Level 1 and earlier
Unauthenticated remote attackers can execute arbitrary code with system privileges by sending a specially crafted API request
Immediately upgrade to IBM Aspera Faspex 4.4.2 Patch Level 2 or later, or restrict access to the obsolete API endpoints
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The recommended remediation is to upgrade to IBM Aspera Faspex 4.4.2 Patch Level 2 or later, where the obsolete API call has been completely removed.
# Verify the current installed version of Faspex
rpm -qa | grep -i faspex
# Apply the official upgrade package obtained from IBM Support
# rpm -Uvh aspera-faspex-<new_version>.rpm2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, block external access to the vulnerable legacy API endpoints using a reverse proxy or web application firewall.
# Nginx configuration snippet to block access to vulnerable endpoints
server {
listen 443 ssl;
server_name faspex.yourdomain.com;
# Block access to obsolete API paths
location ~* ^/aspera/faspex/.*(package_shares|api/v3) {
deny all;
return 403;
}
}3. Log Audit & IoC Verification Commands
Scan the Faspex application logs to identify potential exploitation attempts or suspicious Ruby deserialization payloads.
# Search Faspex logs for known Ruby deserialization patterns and obsolete API calls
grep -riE '(!ruby/object|ActiveSupport::Deprecation|package_shares)' /opt/aspera/faspex/log/Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-47986) is a critical YAML deserialization flaw in the IBM Aspera Faspex file transfer solution. The root cause lies in an obsolete API endpoint that fails to properly sanitize and validate user-supplied input before passing it to the YAML parser. This allows an attacker to trigger unsafe deserialization of arbitrary Ruby objects, leading to remote code execution within the application context.
2. Exploitation Mechanics & Attack Scenario
An attacker sends a specially crafted HTTP POST request targeting obsolete API endpoints (such as /aspera/faspex/package_shares). The payload contains malicious YAML data designed to instantiate specific Ruby classes (e.g., !ruby/object:ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy) that trigger command execution during deserialization. Upon parsing the payload, the server executes the embedded system commands, allowing the attacker to establish a reverse shell or download malware.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 and its inclusion in the CISA KEV (Known Exploited Vulnerabilities) catalog, this vulnerability poses an extreme risk. Successful exploitation grants full system-level access to the file transfer server, potentially leading to massive data breaches, ransomware deployment, and lateral movement across the internal corporate network.
Official Vendor Advisories & References
IBM Aspera Faspex 4.4.2 Patch Level 1 and earlier could allow a remote attacker to execute arbitrary code on the system, caused by a YAML deserialization flaw. By sending a specially crafted obsolete API call, an attacker could exploit this vulnerability to execute arbitrary code on the system. The obsolete API call was removed in Faspex 4.4.2 PL2. IBM X-Force ID: 243512.
Frequently Asked SecOps Questions (CVE-2022-47986)
FAQQ1. How critical is CVE-2022-47986 and is it actively exploited in the wild?
CVE-2022-47986 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 100.0%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-47986?
Primary impacted vendors include ibm across aspera_faspex. Scope summary: IBM Aspera Faspex 4.4.2 Patch Level 1 and all prior versions
Q3. What temporary mitigations or workarounds exist for CVE-2022-47986 before patching?
[Mitigation] Immediately upgrade to IBM Aspera Faspex 4.4.2 Patch Level 2 or later, or restrict access to the obsolete API endpoints Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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