XSS in Microsoft .Net Framework
CVE-2008-3843
Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a query string containing a "<~/" (less-than tilde slash) sequence followed by a crafted STYLE element.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v2 metric
CVSS v2 base score 4.3 (Medium). Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.220 (97.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.220 · newest: 0.220 · change: 0.000
Affected products
- Microsoft .Net Framework — versions 1.0, 1.1, 2.0
- Microsoft Windows 2000
- Microsoft Windows-Nt — versions 2003, 2008, xp
- Microsoft Windows Vista
- Microsoft Windows Xp
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/archive/1/496071/100/0/threaded (mailing-list)
- exchange.xforce.ibmcloud.com/vulnerabilities/44743 (vdb-entry)
- www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf
- securityreason.com/securityalert/4193 (third-party-advisory)
- www.securityfocus.com/archive/1/495667/100/0/threaded (mailing-list)
- www.procheckup.com/Vulnerability_PR08-20.php
Frequently asked questions
- What is CVE-2008-3843?
- CVE-2008-3843 is a vulnerability in Microsoft .Net Framework, classified under Cross-site Scripting. Published 2008-08-27.
- Is CVE-2008-3843 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.