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Critical

Internet Explorer Memory Corruption Vulnerability

IdentifiersCVE-2015-0043CWE-119

CVE-2015-0043 is a memory corruption vulnerability in Microsoft Internet Explorer 8 through 11. Microsoft describes it as an Internet Explorer memory corruption issue that can be triggered when a user visits a specially crafted web site. The flaw is part of the vulnerabilities addressed by Security Update 3034682. The underlying issue is improper handling of objects in memory within Internet Explorer, which can lead to memory corruption and subsequent arbitrary code execution or a browser crash/denial of service.

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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 allow remote code execution in the security context of the current user. If the user is running with administrative privileges, the attacker may be able to fully compromise the affected system. At minimum, exploitation can also cause denial of service through browser or process instability resulting from memory corruption.

Mitigation

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

Microsoft stated there were no specific mitigating factors or workarounds for the memory corruption vulnerabilities beyond applying the security updates. General exposure reduction includes operating users without administrative privileges and limiting browsing to untrusted content. On Windows Server platforms, Internet Explorer Enhanced Security Configuration reduces exposure to specially crafted web content, which is why server ratings were generally lower.

Remediation

Patch, then assume compromise.

Apply Microsoft's Security Update 3034682 for the affected Internet Explorer versions. Per Microsoft's bulletin, systems running Internet Explorer 9, 10, and 11 require both update 3021952 and update 3034196 for full protection. Microsoft also noted installation-order requirements for manual deployment, specifically that update 3021952 should be installed before 3034196.
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

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

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

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

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-2015-0043
NVD
nvd.nist.gov/vuln/detail/CVE-2015-0043
MITRE CWE · CWE-119
cwe.mitre.org
securityfocus.com
securityfocus.com/bid/72413
securitytracker.com
securitytracker.com/id/1031723
docs.microsoft.com
docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-009