JVN#79543573
The installer of Microsoft Teams may insecurely load Dynamic Link Libraries
Overview
The installer of Microsoft Teams may insecurely load Dynamic Link Libraries.
Products Affected
- Installer of Microsoft Teams versions prior to 1.3.00.362
Description
The installer of Microsoft Teams contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries (CWE-427).
Microsoft states that the root cause of this vulnerability is "Application Directory (App Dir) DLL planting", 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
Arbitrary code may be executed with the privilege of the user invoking the installer.
Solution
Use the latest installer
Use the latest installer provided by the developer.
Also when executing the installer, be sure to check there are no suspicious files in the directory where the installer resides.
The developer states this vulnerability was fixed in Microsoft Teams version 1.3.00.362, and Microsoft Teams version 1.3.00.362 and newer versions are not affected.
Note that this vulnerability affects the installer only, thus users who have already installed the software do not need to re-install the software.
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
Asuka Nakajima of NTT Secure Platform Laboratories reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
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-2019-5922 |
| JVN iPedia |
JVNDB-2019-000014 |
Update History
- 2020/04/01
- Information under the section [Solution] was updated, and Microsoft Japan Co.,Ltd. updated the vendor status.