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Medium

Use-after-free RCE in Microsoft Internet Explorer CSS run-in handling

IdentifiersCVE-2014-8967CWE-416

CVE-2014-8967 is a use-after-free memory corruption vulnerability in Microsoft Internet Explorer. According to the provided content, the issue can be triggered by a crafted HTML document using a Cascading Style Sheets (CSS) token sequence that specifies the run-in value for the display property, leading to improper CElement reference counting. This stale object state can result in dereferencing freed memory and subsequent memory corruption. Successful exploitation may allow arbitrary code execution in the context of the current user when the victim renders attacker-controlled web content in Internet Explorer.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in remote code execution in the security context of the current user. If the user has administrative privileges, the attacker may be able to fully compromise the affected system. On systems where users operate with limited privileges, the immediate impact is constrained to that user context. The bulletin also indicates that exploitation occurs through web content, including specially crafted websites, compromised sites, or malicious advertisements.

Mitigation

If you can’t patch tonight, do this now.

The provided content states Microsoft identified no mitigating factors and no workarounds specific to the memory corruption vulnerabilities. Operationally, reducing exposure to untrusted web content, using least-privileged accounts, and relying on Internet Explorer Enhanced Security Configuration on supported Windows Server platforms may reduce risk, but these are not listed as complete mitigations for this specific flaw.

Remediation

Patch, then assume compromise.

Apply Microsoft's Internet Explorer security update 3034682 released on 2015-02-10. The provided content states that for Internet Explorer 9, 10, and 11, both update 3021952 and update 3034196 are required for full protection, and Microsoft revised the bulletin to clarify installation details. Where updates are installed manually, 3021952 should be installed before 3034196 to avoid degraded page rendering. Additional automatically installed prerequisite or companion updates may include 3023607 and, on some platforms, 3036197.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

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VendorProductType
Microsoft CorporationInternet Explorerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2014-8967
NVD
nvd.nist.gov/vuln/detail/CVE-2014-8967
MITRE CWE · CWE-416
cwe.mitre.org
securityfocus.com
securityfocus.com/bid/71483
zerodayinitiative.com
zerodayinitiative.com/advisories/ZDI-14-403