-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 iDEFENSE Security Advisory 11.08.02a: http://www.idefense.com/advisory/11.08.02a.txt File Disclosure Vulnerability in Simple Web Server November 8, 2002 I. BACKGROUND As its name suggests, Peter Sandvik's Simple Web Server is a Linux-based web server. More information about it is available at http://www.linuxstuffs.cjb.net. II. DESCRIPTION Restricted files can be remotely accessed because of Simple Web Server's failure to properly handle malformed URL requests for said files. For example, if a standard URL to access a restricted file is http://server.com/secret/file, the altered URL http://server.com///secret/file will bypass any access control on that file, thereby granting unauthorized access to it. III. ANALYSIS The resulting damage from accessing restricted files on the web server is dependent on the actual file accessed and what kind of information is contained within. Simple Web Server is not a widely distributed web server, according to Netcraft.com. As such, the likelihood of widespread exploitation is unlikely. IV. DETECTION Simple Web Server 0.5.1, running on Red Hat Linux 7.3, is vulnerable. The vulnerability does not seem to be platform-specific, since it works on Debian Linux 3.0 as well. V. WORKAROUND Migrate to other supported web servers, being the software is no longer actively maintained. VI. VENDOR RESPONSE Peter Sandvik said he will suspend work on the project for now, being he "doesn't have time to work on it." VII. CVE INFORMATION The Mitre Corp.'s Common Vulnerabilities and Exposures (CVE) Project assigned the identification number CAN-2002-1238 to this issue. VIII. DISCLOSURE TIMELINE 08/29/2002 Issue disclosed to iDEFENSE 09/25/2002 Maintainer, Peter Sandvik notified 09/25/2002 iDEFENSE clients notified 09/25/2002 Response received from Peter Sandvik (peter.sandvikat_private) 09/26/2002 Started e-mail discussions regarding status of software support 10/31/2002 Last e-mail received regarding status of software support 11/08/2002 Public disclosure IX. CREDIT Tamer Sahin (tsat_private) discovered this vulnerability. Get paid for security research http://www.idefense.com/contributor.html Subscribe to iDEFENSE Advisories: send email to listservat_private, subject line: "subscribe" About iDEFENSE: iDEFENSE is a global security intelligence company that proactively monitors sources throughout the world — from technical vulnerabilities and hacker profiling to the global spread of viruses and other malicious code. Our security intelligence services provide decision-makers, frontline security professionals and network administrators with timely access to actionable intelligence and decision support on cyber-related threats. For more information, visit http://www.idefense.com. - -dave David Endler, CISSP Director, Technical Intelligence iDEFENSE, Inc. 14151 Newbrook Drive Suite 100 Chantilly, VA 20151 voice: 703-344-2632 fax: 703-961-1071 dendlerat_private www.idefense.com -----BEGIN PGP SIGNATURE----- Version: PGP 7.1.2 Comment: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4B0ACC2A iQA/AwUBPcwdxUrdNYRLCswqEQLB3wCfauM7/75ebKpsA70fmHN2I1t2fGMAoNra anqP0AHYTOkh4K5MJnsLXywG =Dx3m -----END PGP SIGNATURE-----
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