CVE-2001-0151

published 2001-06-02

CVE-2001-0151: IIS 5.0 allows remote attackers to cause a denial of service via a series of malformed WebDAV requests.

Priority P4 27 medium 5 CVSS 2.0

AV N AC L Au N C N I N A P

EXPLOIT

IIS 5.0 allows remote attackers to cause a denial of service via a series of malformed WebDAV requests.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
microsoft	internet_information_services	—	—

Detection & IOCs extracted from sources · hover to see the quote

command PROPFIND / HTTP/1.1↗

• → Detect repeated PROPFIND requests with extremely large Content-length values (e.g. ~128008 bytes) and oversized XML bodies sent to IIS 5.0 WebDAV endpoints, which is the specific trigger pattern for this DoS. ↗
• → Alert on PROPFIND HTTP method requests containing malformed/oversized XML payloads with Content-type: text/xml directed at IIS 5.0 servers, particularly when sent in rapid succession. ↗
• → Monitor for IIS service restarts or unexpected IIS worker process crashes following a burst of inbound WebDAV PROPFIND requests, as the exploit is known to restart all IIS services. ↗

• · The exploit targets IIS 5.0 specifically; the overflow buffer length (~128008 bytes) may need adjustment depending on the target environment, meaning detection thresholds should account for variability in payload size. ↗
• · An alternative XML payload variant is noted in the exploit code comments as also being effective at lengths greater than ~65000 bytes, so detection rules should not be limited to a single fixed Content-length value. ↗

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