Home/CVE/Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference
CVE

CVE-2019-9670

Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference

mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection (XXE) vulnerability, as demonstrated by Autodiscover/Autodiscover.xml.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94428
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • 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
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

1
actorAPT29
⬡

Weakness Classification

CWE-611Improper Restriction of XML External Entity Reference
CWE-611Improper Restriction of XML External Entity Reference
▤

Affected Products & Versions

2
synacor zimbra collaboration suite>= 8.7.0 and < 8.7.11
synacor zimbra collaboration suiteall versions
⚠

Public Exploits & PoCs

5
remoteZimbra Collaboration - Autodiscover Servlet XXE and ProxyServlet SSRF (Metasploit)verified
nucleiSynacor Zimbra Collaboration <8.7.11p10 - XML External Entity Injectioncritical
pocpacketstormsecurity.com · Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServle...packetstormsecurity.com
pocisc.sans.edu · 27570isc.sans.edu
pocwww.exploit-db.com · 46693www.exploit-db.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Possible Zimbra Autodiscover Servlet XXE (CVE-2019-9670)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
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.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - QuarksPwDump Dump File
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
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 NVD29 May 2019 · 10:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
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
cisaKEV-CVE-2019-9670
🔗

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.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rceThird Party Advisory
https://bugzilla.zimbra.com/show_bug.cgi?id=109129Broken LinkIssue TrackingPatchThird Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9670US Government Resource
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