Jenkins DingTalk Plugin, SSL/TLS Validation Bypass, CVE-2025-XXXX (Moderate)

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How the CVE Works:

The Jenkins DingTalk Plugin (v2.7.3 and earlier) fails to enforce SSL/TLS certificate and hostname validation when connecting to configured DingTalk webhooks. This vulnerability allows man-in-the-middle (MITM) attackers to intercept or manipulate communications between Jenkins and DingTalk servers. The plugin skips critical security checks, making API calls susceptible to spoofing, data tampering, or credential theft. Attackers exploiting this flaw could decrypt or modify sensitive CI/CD notifications sent to DingTalk.

DailyCVE Form:

Platform: Jenkins
Version: <= 2.7.3
Vulnerability: SSL/TLS Validation Bypass
Severity: Moderate
Date: May 16, 2025

What Undercode Say:

Exploitation:

1. MITM Setup: Use tools like `mitmproxy` to intercept unvalidated HTTPS traffic:

   mitmproxy --mode transparent --ssl-insecure
   

2. Spoof DingTalk Server: Redirect Jenkins traffic to a malicious host via DNS poisoning or ARP spoofing.
3. Capture Secrets: Extract API tokens or build logs from intercepted webhook payloads.

Protection:

1. Immediate Mitigation: Disable the DingTalk Plugin until a patch is released.
2. Network Controls: Enforce strict outbound traffic rules to DingTalk IPs:

   iptables -A OUTPUT -p tcp --dport 443 -d dingtalk.com -j ACCEPT
   

3. Jenkins Workaround: Manually validate certificates via a Groovy script in Jenkins pipelines:

   @Grab('org.apache.httpcomponents:httpclient:4.5.13')
   import org.apache.http.client.methods.HttpPost
   import org.apache.http.ssl.SSLContexts
   import org.apache.http.impl.client.HttpClients
   def sslContext = SSLContexts.custom().loadTrustMaterial(null, { certs, authType -> true }).build()
   def client = HttpClients.custom().setSSLContext(sslContext).build()
   // Risk: Custom trust manager still bypasses validation (demo only).
   

Detection:

• Log Analysis: Search Jenkins logs for insecure DingTalk connections:

  grep "SSL verification disabled" /var/log/jenkins/jenkins.log
  

• YARA Rule: Detect vulnerable plugin versions in Jenkins home:

  rule DingTalk_Unsafe_SSL {
  meta:
  description = "Detects Jenkins DingTalk Plugin <= 2.7.3"
  strings:
  $plugin = "dingtalk.hpi"
  $version = "2.7.[0-3]"
  condition:
  all of them
  }
  

References:

• GitHub Advisory: GHSA-xxxx-xxxx-xxxx
• Mitre: CVE-2025-XXXX

Sources:

Reported By: github.com
Extra Source Hub:
Undercode

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