PT-2021-6305 · Microsoft · Windows Encrypting File System+1

James Forshaw · Published 2021-12-14 · Updated 2022-07-12 · CVE-2021-43893

Positive Technologies (AI Summary)

CVSS v2.0

8.5

High

Base vector

AV:N/AC:M/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Windows Encrypting File System (EFS) (affected versions not specified)

Description The issue is related to insufficient access restrictions in the Windows Encrypting File System (EFS) component, allowing a remote attacker to elevate their privileges. An elevation-of-privilege vulnerability exists, enabling attackers to affect the system. There is evidence of this vulnerability being exploited in real-world attacks, including dropping files on a domain controller.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

LPE

Exposure of Resource to Wrong Sphere

Improper Privilege Management

Weakness Enumeration

CWE-668

CWE-269

Related Identifiers

BDU:2022-01290

CVE-2021-43893

Affected Products

Windows

Windows Encrypting File System

References · 23

• 🔥 https://github.com/jbaines-r7/blankspace · Exploit
• https://safe-surf.ru/specialists/bulletins-nkcki/673069 · Security Note
• https://bdu.fstec.ru/vul/2022-01290 · Security Note
• https://osv.dev/vulnerability/CVE-2021-43893 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43893 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43893 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-43893 · Security Note
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-43893 · Vendor Advisory
• https://t.me/cybersecuritytechnologies/5414 · Telegram Post
• https://t.me/w2hack/2033 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2021121473 · Note
• https://t.me/rnetsec/16457 · Telegram Post
• https://t.me/malwr/6056 · Telegram Post
• http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.html · Note