JVN#51615542
Adobe Reader fails to properly handle signatures
Overview
Adobe Reader fails to properly handle RSA signatures.
Products Affected
- Adobe Reader 8.x and earlier
Description
Adobe Reader contains an issue where it may fail to properly verify RSA signatures.
Impact
An attacker may be able to forge an RSA signature on a PDF document.
Solution
Update the software
Update to the latest version according to the information provided by the developer.
Note that this issue was resolved in Adobe Reader 9.
Vendor Status
References
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US-CERT Vulnerability Note VU#845620
Multiple RSA implementations fail to properly handle signatures
JPCERT/CC Addendum
This JVN publication was delayed to 2012/8/30 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 2012.08.30
| Measures | Conditions | Severity |
|---|---|---|
| Access Required | can be attacked over the Internet using packets |
|
| Authentication | anonymous or no authentication (IP addresses do not count) |
|
| User Interaction Required | the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file |
|
| Exploit Complexity | expertise and/or luck required (guessing correctly in medium-sized space, kernel expertise) |
|
Credit
Masahiko Takenaka of FUJITSU LABORATORIES LTD. 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 |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2006-4339 |
| JVN iPedia |
JVNDB-2012-000079 |