Home/CVE/IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.ht
CVE

CVE-2001-0004

IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.ht

IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.htr" to the requested URL, which causes the files to be parsed by the .HTR ISAPI extension, aka a variant of the "File Fragment Reading via .HTR" vulnerability.

MEDIUM · CVSS 5 EPSS 0.74228
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  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
Sigma rules0 YARA rules0
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Affected Products & Versions

2
microsoft internet information serverall versions
microsoft internet information servicesall versions
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Detection Rules (IDS/IPS)

3
snort-communityFILE-IDENTIFY .htr access file download requestmisc-activity
snort-communitySERVER-IIS global.asa accessweb-application-activity
snort-communitySERVER-IIS +.htr code fragment attemptweb-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Scoring & Timeline

5
MEDIUM · CVSS v2 (legacy) · cve@mitre.org
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Published to NVD12 Feb 2001 · 05:00 AM
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References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://marc.info/?l=bugtraq&m=97897954625305&w=2
http://www.securityfocus.com/bid/2313
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-004
https://exchange.xforce.ibmcloud.com/vulnerabilities/5903
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