JVN#63012325
The installer of e-Tax Software may insecurely load Dynamic Link Libraries
Overview
The installer of e-Tax Software may insecurely load Dynamic Link Libraries.
Products Affected
- The installer of e-Tax Software
Description
The installer of e-Tax Software provided by National Tax Agency contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries.
Impact
This vulnerability can be exploited when the following condition is met. If this vulnerability is exploited, arbitrary code may be executed with the privilege of the user invoking the installer.
- A user is tricked into placing a malicious DLL file prepared by an attacker in a specific folder.
Solution
Use the latest installer of e-Tax Software
Users who are intended to install e-Tax Software for the first time or to upgrade the software, be sure to use the latest installer of e-Tax Software.
Vendor Status
| Vendor | Link |
| National Tax Agency | About e-Tax Software maintenance |
References
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
Yuji Tounai of NTT Communications Corporation 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-2016-4901 |
| JVN iPedia |
JVNDB-2016-000207 |
Update History
- 2016/10/19
- Information under the section "Other Information" was updated.
- 2016/10/27
- Information under the section "Solution" was updated.