[UNIX] SWS Web Server Multiple Vulnerabilities
From: support@securiteam.comDate: 09/12/02
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From: support@securiteam.com To: list@securiteam.com Date: Thu, 12 Sep 2002 09:00:33 +0200 (CEST)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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SWS Web Server Multiple Vulnerabilities
------------------------------------------------------------------------
SUMMARY
<http://www.linuxprogramlama.com> SWS Web server is a 160 lines of .c web
server for Linux. The product has been found to contain multiple security
vulnerabilities.
DETAILS
Vulnerable systems:
* SWS Web Server version 0.1.1 and version 0.1.2
Bug description:
Multiple vulnerabilities exist in the SWS Web server:
1. Server does not drop root privileges.
2. Server does not check directory traversal (../) allowing access to any
file with root privileges.
3. Server has buffer overflow when it tries to read files that are longer
than 4050 bytes
char buffer[4050];
..
while((i=fread(buffer,1,4096, f)) > 0)
This has the potential of allowing code execution with root privileges.
4. If a 404-error message is configured on SWS server, a vulnerability in
the code causes the file descriptor for 404 messages to no close, allowing
a DoS against whole system.
if ( (f=fopen(hatasayfasi,"r") )==NULL)
{
write_err_log ("Uyar+ hatasayfas+ bulunamad+.");
// write_err_log ("Warning hatasayfasi not found, edit
/etc/sws.conf ");
return 0;
}
}
5. Server is limited to one connection in time and never checks any
timeouts allowing a DoS against the server.
6. If recv() fails
i = recv(sock, recvBuffer, 4000, 0);
if (i == -1) write_err_log("Okuma hatal+...");
//write_err_log("Reading wrong...");
recvBuffer[i] = '\0';
..
cp = buf + 5;
cp2 = strstr(cp, " HTTP");
1 byte before the dynamically allocated buffer is overwritten with zero
and strstr() is called to access that un-initialized data.
ADDITIONAL INFORMATION
The information has been provided by <mailto:3APA3A@SECURITY.NNOV.RU>
3APA3A.
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