Microsoft Internet Explorer Memory Corruption Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-01-28
• EPSS: 83% chance of exploitation in the next 30 days (higher than 100% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official description

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."

CISA: Microsoft Internet Explorer contains a memory corruption vulnerability that allows remote attackers to execute code in the context of the current user.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 28 Jul 2022): Apply updates per vendor instructions.

• Patch on docs.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on technet.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advis…Broken LinkMitigation
• secunia.com/advisories/57908Broken Link
• securitytracker.com/idBroken LinkThird Party AdvisoryVDB Entry
• www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-expl…Broken Link
• www.kb.cert.org/vuls/id/222929MitigationThird Party AdvisoryUS Government Resource
• www.osvdb.org/106311Broken Link
• www.securityfocus.com/bid/67075Broken LinkThird Party AdvisoryVDB Entry
• www.signalsec.com/cve-2014-1776-ie-0day-analysisExploitThird Party Advisory
• docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021PatchVendor Advisory
• technet.microsoft.com/library/security/2963983MitigationPatchVendor Advisory
• www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-…Third Party Advisory
• www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-…Third Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource