what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

Boa Web Server 0.94.13 / 0.94.14 Authentication Bypass

Boa Web Server 0.94.13 / 0.94.14 Authentication Bypass
Posted Nov 21, 2022
Authored by George Tsimpidas

Boa Web Server versions 0.94.13 through 0.94.14 fail to validate the correct security constraint on the HEAD HTTP method allowing everyone to bypass the Basic Authorization mechanism.

tags | exploit, web, bypass
SHA-256 | 74e7caa0bc29548de21944cffdfcab5eda40da0abe02546c835047e2ff2799f1

Boa Web Server 0.94.13 / 0.94.14 Authentication Bypass

Change Mirror Download
# Exploit Title: Boa Web Server 0.94.13-0.94.14 Authentication Bypass
# Date: 19-11-2022
# Exploit Author: George Tsimpidas
# Vendor: https://github.com/gpg/boa
# CVE: N/A
# Tested on: Debian 5.18.5

Description :

Boa Web Server Versions from 0.94.13 - 0.94.14 fail to validate the
correct security constraint on the HEAD http method allowing everyone
to bypass the Basic Authorization Mechanism.

Culprit :

if (!memcmp(req->logline, "GET ", 4))
req->method = M_GET;
else if (!memcmp(req->logline, "HEAD ", 5))
/* head is just get w/no body */
req->method = M_HEAD;
else if (!memcmp(req->logline, "POST ", 5))
req->method = M_POST;
else {
log_error_doc(req);
fprintf(stderr, "malformed request: \"%s\"\n", req->logline);
send_r_not_implemented(req);
return 0;
}

The req->method = M_HEAD; is being parsed directly on the response.c
file, looking at how the method is being implemented for one of the
response codes :

/* R_NOT_IMP: 505 */
void send_r_bad_version(request * req)
{
SQUASH_KA(req);
req->response_status = R_BAD_VERSION;
if (!req->simple) {
req_write(req, "HTTP/1.0 505 HTTP Version Not Supported\r\n");
print_http_headers(req);
req_write(req, "Content-Type: " HTML "\r\n\r\n"); /* terminate
header */
}
if (req->method != M_HEAD) {
req_write(req,
"<HTML><HEAD><TITLE>505 HTTP Version Not
Supported</TITLE></HEAD>\n"
"<BODY><H1>505 HTTP Version Not Supported</H1>\nHTTP
versions "
"other than 0.9 and 1.0 "
"are not supported in Boa.\n<p><p>Version encountered: ");
req_write(req, req->http_version);
req_write(req, "<p><p></BODY></HTML>\n");
}
req_flush(req);
}


Above code condition indicates that if (req->method != M_HEAD) therefore
if the the requested method does not equal to M_HEAD then

req_write(req,
"<HTML><HEAD><TITLE>505 HTTP Version Not
Supported</TITLE></HEAD>\n"
"<BODY><H1>505 HTTP Version Not Supported</H1>\nHTTP
versions "
"other than 0.9 and 1.0 "
"are not supported in Boa.\n<p><p>Version encountered: ");
req_write(req, req->http_version);
req_write(req, "<p><p></BODY></HTML>\n");
}

So if the method actually contains the http method of HEAD it's being
passed for every function that includes all the response code methods.
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close