GreaseKit and Creammonkey GM security bypass
| greasekit-creammonkey-gm-security-bypass (39272) |  Medium Risk |
Description:
GreaseKit and Creammonkey could allow a remote attacker to bypass security restrictions. If userscript is enabled, the applications fail to protect the GM_addSytle, GM_log, GM_openInTab, GM_setValue, GM_getValue, and GM_xmlhttpRequest functions. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to send specially-crafted HTTP requests and modify configuration settings.
*CVSS:
| Base Score: | 4 |
| Access Vector: | Network |
| Access Complexity: | High |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 3 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Upgrade to the latest version of GreaseKit and Creammonkey (1.4 or later), available from the Greasekit Web page. See References.
References:
- Greasekit Web page: GreaseKit (and Creammonkey) GM APIs Vulnerability.
- CVE-2007-6640: Creammonkey 0.9 through 1.1 and GreaseKit 1.2 through 1.3 does not properly prevent access to dangerous functions, which allows remote attackers to read the configuration, modify the configuration, or send an HTTP request via the (1) GM_addStyle, (2) GM_log, (3) GM_openInTab, (4) GM_setValue, (5) GM_getValue, or (6) GM_xmlhttpRequest function within a web page on which a userscript is configured.
- SA28241: GreaseKit / Creammonkey GM API Vulnerability
Platforms Affected:
- Apple Safari
- KATO Kazuyoshi Creammonkey 0.9 - 1.1
- KATO Kazuyoshi GreaseKit 1.2 - 1.3
Reported:
Dec 26, 2007
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For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.