JVN#91151862
Multiple Microsoft Windows applications and installers may insecurely load Dynamic Link Libraries
Overview
Multiple Microsoft Windows applications and installers may insecurely load Dynamic Link Libraries.
Products Affected
- Microsoft OneDrive - CVE-2018-0592
- The installer of Microsoft OneDrive - CVE-2018-0593
- Skype for Windows - CVE-2018-0594
- The installer of Skype for Windows - CVE-2018-0595
- The installer of Visual Studio Community - CVE-2018-0596
- The installer of Visual Studio Code - CVE-2018-0597
Description
Multiple Windows applications and installers provided by Microsoft contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries in the same directory where applications and/or installers reside (CWE-427).
Microsoft states that the root cause of this vulnerability is "Application Directory (App Dir) DLL planting" and attacks exploiting this vulnerability are limited, thus there is no plan to release any security updates to address this issue.
For details, refer to "Application Directory (App Dir) DLL planting" released by Microsoft.
Impact
If a crafted DLL file is in the same directory where the vulnerable applicaion and/or installer resides, arbitrary code may be executed with the privilege of the user invoking the application or installer.
Solution
Apply Workaround
- Make sure to allow that the system directories are writable only by administrators, which is the Windows' initial configuration.
- Operate Windows PCs with a standard user (non-administrator) account. Administrator accounts should be used only when necessary.
- When invoking an installer, make sure there are no unrelated files in the same directory where the installer resides. It is strongly recommended to copy the installer into a newly created directory and invoke it from that directory.
- Make sure there are no untrusted files in the directory where the application is installed.
- If your organization uses shared directories to place installers for organizational operations, make sure that the shared directory is set read-only for non-administrative users.
Apply respective workarounds in accordance with how respective applications are installed and used.
References
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Japan Vulnerability Notes JVNTA#91240916
Insecure DLL Loading and Command Execution Issues on Many Windows Application Programs
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Comment
This analysis assumes that the user is tricked into placing a malicious DLL file prepared by an attacker in a specific folder.
Credit
Following researchers reported respective vulnerabilities to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning partnership.
CVE-2018-0592, CVE-2018-0593, CVE-2018-0596
Takashi Yoshikawa of Mitsui Bussan Secure Directions, Inc.
CVE-2018-0594
BlackWingCat of Pink Flying Whale
CVE-2018-0595, CVE-2018-0597
Eili Masami
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2018-0592 |
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CVE-2018-0593 |
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CVE-2018-0594 |
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CVE-2018-0595 |
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CVE-2018-0596 |
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CVE-2018-0597 |
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| JVN iPedia |
JVNDB-2018-000049 |