JVN#20459920
Microsoft Office discloses a file path of a local file
Overview
Microsoft Office discloses a file path of a local file through the alternative text of a object embedded in the Office documents.
Products Affected
- Microsoft Office 2007
- Microsoft Office 2010
- Microsoft Office for Mac 2011
Description
When a file such as a clipart or an image is inserted in Office documents, the absolute path of the local file is stored in "alternative text".
Impact
An attacker may obtain information about the file system or the user name through Office documents.
Solution
Upgrade the Software
Upgrade to the appropriate versions according to the information provided by the developer.
- Microsoft Office 2013 (latest version) for Office on Windows
- Microsoft Office 2016 for Mac for Office on Mac
Apply a workaround
The following workaround may mitigate the affects of this vulnerability.
- Manually delete or edit "alternative text" of objects in Office documents.
References
JPCERT/CC Addendum
This JVN publication was delayed to 2015/08/12 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.
Vulnerability Analysis by JPCERT/CC
Analyzed on 2015.08.12 (CVSS Base Metrics)
| Measures | Severity | Description | ||
|---|---|---|---|---|
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) | A vulnerability exploitable with network access means the vulnerable software is bound to the network stack and the attacker does not require local network access or local access. Such a vulnerability is often termed "remotely exploitable". |
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) | The access conditions are somewhat specialized. |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) | Authentication is not required to exploit the vulnerability. |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) | There is considerable informational disclosure. Access to some system files is possible, but the attacker does not have control over what is obtained, or the scope of the loss is constrained. |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) | There is no impact to the integrity of the system. |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) | There is no impact to the availability of the system. |
Base Score:4.3
Comment
This analysis assumes that an attacker obtains the informaion in "alternative text" which is created by users.
Credit
Yosuke HASEGAWA of SecureSky Technology Inc. and Miyuki Chikara of MARUS JAPAN Inc. 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 |
|
| JVN iPedia |
JVNDB-2015-000112 |