JVN#83826673
The installers of UNLHA32.DLL, UNARJ32.DLL and LHMelting may insecurely load Dynamic Link Libraries
Overview
The installers of UNLHA32.DLL, UNARJ32.DLL and LHMelting provided by Micco may insecurely load Dynamic Link Libraries.
Products Affected
- UNLHA32.DLL for Win32 Ver 2.67.1.2 and earlier (CVE-2019-5911)
- UNARJ32.DLL for Win32 Ver 1.10.1.25 and earlier (CVE-2019-5912)
- LHMelting for Win32 Ver 1.65.3.6 and earlier (CVE-2019-5913)
Description
The installers of UNLHA32.DLL, UNARJ32.DLL and LHMelting provided by Micco use the old version of Self-Extracting Archives created by UNLHA32.DLL.
They contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries (CWE-427, CVE-2018-16189).
Impact
Arbitrary code may be executed with the privilege of the user invoking the installer.
Solution
Use the latest installer and update the Software
Use the latest installer according to the information provided by the developer.
When installing products, be sure to check there are no suspicious files in the directory where the installer resides.
Note that this vulnerability affects the installers only, and the latest version of DLLs contain fixes for the other vulnerability (CVE-2018-16190).
References
-
Japan Vulnerability Notes JVNTA#91240916
Insecure DLL Loading and Command Execution Issues on Many Windows Application Programs -
Japan Vulnerability Notes JVN#52168232
UNLHA32.DLL, UNARJ32.DLL, LHMelting and LMLzh32.DLL may insecurely load Dynamic Link Libraries
JPCERT/CC Addendum
This JVN publication was delayed to 2019/1/31 after the developer's fix was published.
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
Eili Masami reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
Other Information
| JPCERT Alert | |
| JPCERT Reports | |
| CERT Advisory | |
| CPNI Advisory | |
| TRnotes | |
| CVE |
CVE-2019-5911 |
|
CVE-2019-5912 |
|
|
CVE-2019-5913 |
|
| JVN iPedia |
JVNDB-2019-000005 |