Home/CVE/Microsoft XML Core Services Memory Corruption Vulnerability
CVE

CVE-2012-1889

Microsoft XML Core Services Memory Corruption Vulnerability

Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0 accesses uninitialized memory locations, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

HIGH · CVSS 8.8 ⚠ CISA KEV EPSS 0.93117
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  • 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
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-787Out-of-bounds Write
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

1
microsoft xml core servicesall versions
⚠

Public Exploits & PoCs

1
remoteMicrosoft XML Core Services - MSXML Uninitialized Memory Corruption (MS12-043) (Metasploit)verified
◈

Detection Rules (IDS/IPS)

3
et-openET WEB_CLIENT Potential MSXML2.FreeThreadedDOMDocument Uninitialized Memory Corruption Attemptattempted-user
snort-communityEXPLOIT-KIT Blackhole exploit kit JavaScript carat string splitting with hostile applettrojan-activity
snort-communityEXPLOIT-KIT Blackholev2/Darkleech exploit kit landing page requesttrojan-activity
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

8
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.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighCode Executed Via Office Add-in XLL File
producthighPotential Persistence Via Microsoft Office Add-In
producthighPotential Persistence Via Microsoft Office Startup Folder
producthighFile With Uncommon Extension Created By An Office Application
producthighOffice Macro File Creation From Suspicious Process
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · secure@microsoft.com
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 NVD13 Jun 2012 · 04:46 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
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-2012-1889
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://technet.microsoft.com/security/advisory/2719615Vendor Advisory
http://www.us-cert.gov/cas/techalerts/TA12-174A.htmlThird Party AdvisoryUS Government Resource
http://www.us-cert.gov/cas/techalerts/TA12-192A.htmlThird Party AdvisoryUS Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043PatchVendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15195Broken Link
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2012-1889US Government Resource
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