CVE-2020-1350
Confirmed PUBLISHEDA remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.
- CVE Published
- Jul 14, 2020
- Exploitation Reported
- Nov 03, 2021
- CVSS
- 10.0 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Microsoft |
Windows Server
|
2019 |
Affected |
| Microsoft |
Windows Server
|
2019 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2016 |
Affected |
| Microsoft |
Windows Server
|
2016 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2008 for 32-bit Systems Service Pack 2 |
Affected |
| Microsoft |
Windows Server
|
2008 for 32-bit Systems Service Pack 2 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2008 for x64-based Systems Service Pack 2 |
Affected |
| Microsoft |
Windows Server
|
2008 for x64-based Systems Service Pack 2 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2008 R2 for x64-based Systems Service Pack 1 |
Affected |
| Microsoft |
Windows Server
|
2008 R2 for x64-based Systems Service Pack 1 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2012 |
Affected |
| Microsoft |
Windows Server
|
2012 (Core installation) |
Affected |
| Microsoft |
Windows Server
|
2012 R2 |
Affected |
| Microsoft |
Windows Server
|
2012 R2 (Core installation) |
Affected |
| Microsoft |
Windows Server, version 1909 (Server Core installation)
|
unspecified |
Affected |
| Microsoft |
Windows Server, version 1903 (Server Core installation)
|
unspecified |
Affected |
| Microsoft |
Windows Server, version 2004 (Server Core installation)
|
unspecified |
Affected |
CVE References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350 portal.msrc.microsoft.com · CVE Record https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CV...
- packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial-Of-Se... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2021-11-03 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:C/I:C/A:C
Exploitation Status
Exploited in the wild
Recorded 2021-11-03 00:00:00 UTC · CISA
Proof of concept available
Recorded 2020-07-14 19:02:25 UTC · GitHub
Weaknesses (CWE)
-
Improper Input Validation
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2020-07-26 02:12:36 UTC · 2 stars
A registry-based workaround can be used to help protect an affected Windows server, and it can be implemented without requiring an administrator to restart the server. Because of the volatility of this vulnerability, administrators may have to implement the workaround before they apply the security update in order to enable them to update their systems by using a standard deployment cadence.
github · Created 2020-07-20 03:44:58 UTC · 4 stars
A basic proof of concept for CVE-2020-1350
github · Created 2020-07-19 17:32:47 UTC · 0 stars
DNS Vulnerability - CVE-2020-1350
github · Created 2020-07-18 13:49:54 UTC · 2 stars
Scanner and Mitigator for CVE 2020-1350
github · Created 2020-07-17 05:41:19 UTC · 10 stars
CVE-2020-1350 Proof-of-Concept
github · Created 2020-07-16 16:46:48 UTC · 18 stars
Denial of Service PoC for CVE-2020-1350 (SIGRed)
github · Created 2020-07-15 23:00:00 UTC · 237 stars
A denial-of-service proof-of-concept for CVE-2020-1350
github · Created 2020-07-15 19:43:39 UTC · 0 stars
Windows registry mitigation response to CVE-2020-1350
github · Created 2020-07-15 05:46:31 UTC · 14 stars
This Powershell Script is checking if your server is vulnerable for the CVE-2020-1350 Remote Code Execution flaw in the Windows DNS Service
github · Created 2020-07-14 21:55:57 UTC · 7 stars
Fake exploit tool, designed to rickroll users attempting to actually exploit.
github · Created 2020-07-14 19:28:46 UTC · 4 stars
github · Created 2020-07-14 19:02:25 UTC · 278 stars
HoneyPoC: Proof-of-Concept (PoC) script to exploit SIGRed (CVE-2020-1350). Achieves Domain Admin on Domain Controllers running Windows Server 2000 up to Windows Server 2019.
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
22:54 UTC about 6 years ago22:54 UTC · about 6 years ago
CVE published
Vulnerability disclosed publicly
-
19:02 UTC about 6 years ago19:02 UTC · about 6 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC over 6 years ago00:00 UTC · over 6 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2020-1350
{
"cve_id": "CVE-2020-1350",
"title": "A remote code execution vulnerability exists in Windows Domain Name System se...",
"affected_vendor": "Microsoft",
"affected_product": "Windows Server, Windows Server, version 1909 (Server Core installation), Windows Server, version 1903 (Server Core installation), Windows Server, version 2004 (Server Core installation)",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 10.0,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}