Vulnerabilities > CVE-2013-5474 - Race Condition vulnerability in Cisco IOS

CVSS 7.8 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

COMPLETE

network

low complexity

cisco

CWE-362

nessus

NVD

Published: 2013-09-27

Updated: 2013-10-07

Summary

Race condition in the IPv6 virtual fragmentation reassembly (VFR) implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.3 allows remote attackers to cause a denial of service (device reload or hang) via fragmented IPv6 packets, aka Bug ID CSCud64812.

Vulnerable Configurations

Part	Description	Count
OS	Cisco Cisco IOS 12.2 Cisco IOS 12.3 Cisco IOS 12.4 Cisco IOS 15.0 Cisco IOS 15.1 Cisco IOS 15.2 Cisco IOS 15.3	7

Common Weakness Enumeration (CWE)

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Common Attack Pattern Enumeration and Classification (CAPEC)

Leveraging Race Conditions
This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.

Nessus

NASL family	CISCO
NASL id	CISCO-SA-20130925-IPV6VFR.NASL
description	A vulnerability in the implementation of the virtual fragmentation reassembly (VFR) feature for IP version 6 (IPv6) in Cisco IOS Software could allow an unauthenticated, remote attacker to cause an affected device to hang or reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a race condition while accessing the reassembly queue for IPv6 fragments. An attacker could exploit this vulnerability by sending a crafted stream of valid IPv6 fragments. Repeated exploitation may result in a sustained DoS condition. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability.
last seen	2019-10-28
modified	2013-10-07
plugin id	70319
published	2013-10-07
reporter	This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
source	https://www.tenable.com/plugins/nessus/70319
title	Cisco IOS Software IPv6 Virtual Fragmentation Reassembly Denial of Service Vulnerability (cisco-sa-20130925-ipv6vfr)
code	#TRUSTED 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 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Cisco Security Advisory cisco-sa-20130925-ipv6vfr. # The text itself is copyright (C) Cisco # include("compat.inc"); if (description) { script_id(70319); script_version("1.13"); script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15"); script_cve_id("CVE-2013-5474"); script_bugtraq_id(62638); script_xref(name:"CISCO-BUG-ID", value:"CSCud64812"); script_xref(name:"CISCO-SA", value:"cisco-sa-20130925-ipv6vfr"); script_name(english:"Cisco IOS Software IPv6 Virtual Fragmentation Reassembly Denial of Service Vulnerability (cisco-sa-20130925-ipv6vfr)"); script_summary(english:"Checks the IOS version."); script_set_attribute( attribute:"synopsis", value:"The remote device is missing a vendor-supplied security patch." ); script_set_attribute( attribute:"description", value: "A vulnerability in the implementation of the virtual fragmentation reassembly (VFR) feature for IP version 6 (IPv6) in Cisco IOS Software could allow an unauthenticated, remote attacker to cause an affected device to hang or reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a race condition while accessing the reassembly queue for IPv6 fragments. An attacker could exploit this vulnerability by sending a crafted stream of valid IPv6 fragments. Repeated exploitation may result in a sustained DoS condition. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability." ); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ipv6vfr script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?330e4285" ); script_set_attribute( attribute:"solution", value: "Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20130925-ipv6vfr." ); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios"); script_set_attribute(attribute:"vuln_publication_date", value:"2013/09/25"); script_set_attribute(attribute:"patch_publication_date", value:"2013/09/23"); script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/07"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc."); script_family(english:"CISCO"); script_dependencies("cisco_ios_version.nasl"); script_require_keys("Host/Cisco/IOS/Version"); exit(0); } include("audit.inc"); include("cisco_func.inc"); include("cisco_kb_cmd_func.inc"); flag = 0; override = 0; version = get_kb_item_or_exit("Host/Cisco/IOS/Version"); if ( version == '12.3(11)T' ) flag++; if ( version == '12.3(11)T1' ) flag++; if ( version == '12.3(11)T10' ) flag++; if ( version == '12.3(11)T11' ) flag++; if ( version == '12.3(11)T12' ) flag++; if ( version == '12.3(11)T2' ) flag++; if ( version == '12.3(11)T2a' ) flag++; if ( version == '12.3(11)T3' ) flag++; if ( version == '12.3(11)T4' ) flag++; if ( version == '12.3(11)T5' ) flag++; if ( version == '12.3(11)T6' ) flag++; if ( version == '12.3(11)T7' ) flag++; if ( version == '12.3(11)T8' ) flag++; if ( version == '12.3(11)T9' ) flag++; if ( version == '12.3(11)XL' ) flag++; if ( version == '12.3(11)XL1' ) flag++; if ( version == '12.3(11)XL2' ) flag++; if ( version == '12.3(11)XL3' ) flag++; if ( version == '12.3(11)YK' ) flag++; if ( version == '12.3(11)YK1' ) flag++; if ( version == '12.3(11)YK2' ) flag++; if ( version == '12.3(11)YK3' ) flag++; if ( version == '12.3(11)YN' ) flag++; if ( version == '12.3(11)YS' ) flag++; if ( version == '12.3(11)YS1' ) flag++; if ( version == '12.3(11)YS2' ) flag++; if ( version == '12.3(11)YZ' ) flag++; if ( version == '12.3(11)YZ1' ) flag++; if ( version == '12.3(11)YZ2' ) flag++; if ( version == '12.3(11)ZB' ) flag++; if ( version == '12.3(11)ZB1' ) flag++; if ( version == '12.3(11)ZB2' ) flag++; if ( version == '12.3(14)T' ) flag++; if ( version == '12.3(14)T1' ) flag++; if ( version == '12.3(14)T2' ) flag++; if ( version == '12.3(14)T3' ) flag++; if ( version == '12.3(14)T4' ) flag++; if ( version == '12.3(14)T5' ) flag++; if ( version == '12.3(14)T6' ) flag++; if ( version == '12.3(14)T7' ) flag++; 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if ( version == '12.4(20)YA' ) flag++; if ( version == '12.4(20)YA1' ) flag++; if ( version == '12.4(20)YA2' ) flag++; if ( version == '12.4(20)YA3' ) flag++; if ( version == '12.4(21)' ) flag++; if ( version == '12.4(21a)' ) flag++; if ( version == '12.4(21a)M1' ) flag++; if ( version == '12.4(22)GC1' ) flag++; if ( version == '12.4(22)GC1a' ) flag++; if ( version == '12.4(22)T' ) flag++; if ( version == '12.4(22)T1' ) flag++; if ( version == '12.4(22)T2' ) flag++; if ( version == '12.4(22)T3' ) flag++; if ( version == '12.4(22)T4' ) flag++; if ( version == '12.4(22)T5' ) flag++; if ( version == '12.4(22)XR' ) flag++; if ( version == '12.4(22)XR1' ) flag++; if ( version == '12.4(22)XR10' ) flag++; if ( version == '12.4(22)XR11' ) flag++; if ( version == '12.4(22)XR12' ) flag++; if ( version == '12.4(22)XR2' ) flag++; if ( version == '12.4(22)XR3' ) flag++; if ( version == '12.4(22)XR4' ) flag++; if ( version == '12.4(22)XR5' ) flag++; if ( version == '12.4(22)XR6' ) flag++; if ( version == '12.4(22)XR7' ) flag++; if ( version == '12.4(22)XR8' ) flag++; if ( version == '12.4(22)XR9' ) flag++; if ( version == '12.4(22)YB' ) flag++; if ( version == '12.4(22)YB1' ) flag++; if ( version == '12.4(22)YB4' ) flag++; if ( version == '12.4(22)YB5' ) flag++; if ( version == '12.4(22)YB6' ) flag++; if ( version == '12.4(22)YB7' ) flag++; if ( version == '12.4(22)YB8' ) flag++; if ( version == '12.4(22)YD' ) flag++; if ( version == '12.4(22)YD1' ) flag++; if ( version == '12.4(22)YD2' ) flag++; if ( version == '12.4(22)YD3' ) flag++; if ( version == '12.4(22)YD4' ) flag++; if ( version == '12.4(22)YE' ) flag++; if ( version == '12.4(22)YE1' ) flag++; if ( version == '12.4(22)YE2' ) flag++; if ( version == '12.4(22)YE3' ) flag++; if ( version == '12.4(22)YE4' ) flag++; if ( version == '12.4(22)YE5' ) flag++; if ( version == '12.4(22)YE6' ) flag++; if ( version == '12.4(23)' ) flag++; if ( version == '12.4(23a)' ) flag++; if ( version == '12.4(23b)' ) flag++; if ( version == '12.4(23b)M1' ) flag++; if ( version == '12.4(23c)' ) flag++; if ( version == '12.4(23d)' ) flag++; if ( version == '12.4(23e)' ) flag++; if ( version == '12.4(24)GC1' ) flag++; if ( version == '12.4(24)GC3' ) flag++; if ( version == '12.4(24)GC3a' ) flag++; if ( version == '12.4(24)GC4' ) flag++; if ( version == '12.4(24)GC5' ) flag++; if ( version == '12.4(24)MDA' ) flag++; if ( version == '12.4(24)MDA1' ) flag++; if ( version == '12.4(24)MDA10' ) flag++; if ( version == '12.4(24)MDA11' ) flag++; if ( version == '12.4(24)MDA12' ) flag++; if ( version == '12.4(24)MDA13' ) flag++; if ( version == '12.4(24)MDA2' ) flag++; if ( version == '12.4(24)MDA3' ) flag++; if ( version == '12.4(24)MDA4' ) flag++; if ( version == '12.4(24)MDA5' ) flag++; if ( version == '12.4(24)MDA6' ) flag++; if ( version == '12.4(24)MDA7' ) flag++; if ( version == '12.4(24)MDA8' ) flag++; if ( version == '12.4(24)MDA9' ) flag++; if ( version == '12.4(24)MDB' ) flag++; if ( version == '12.4(24)MDB1' ) flag++; if ( version == '12.4(24)MDB10' ) flag++; if ( version == '12.4(24)MDB11' ) flag++; if ( version == '12.4(24)MDB12' ) flag++; if ( version == '12.4(24)MDB13' ) flag++; if ( version == '12.4(24)MDB14' ) flag++; if ( version == '12.4(24)MDB3' ) flag++; if ( version == '12.4(24)MDB4' ) flag++; if ( version == '12.4(24)MDB5' ) flag++; if ( version == '12.4(24)MDB5a' ) flag++; if ( version == '12.4(24)MDB6' ) flag++; if ( version == '12.4(24)MDB7' ) flag++; if ( version == '12.4(24)MDB8' ) flag++; if ( version == '12.4(24)MDB9' ) flag++; if ( version == '12.4(24)T' ) flag++; if ( version == '12.4(24)T1' ) flag++; if ( version == '12.4(24)T2' ) flag++; if ( version == '12.4(24)T3' ) flag++; if ( version == '12.4(24)T31f' ) flag++; if ( version == '12.4(24)T32f' ) flag++; if ( version == '12.4(24)T33f' ) flag++; if ( version == '12.4(24)T34f' ) flag++; if ( version == '12.4(24)T35c' ) flag++; if ( version == '12.4(24)T35f' ) flag++; if ( version == '12.4(24)T3c' ) flag++; if ( version == '12.4(24)T3e' ) flag++; if ( version == '12.4(24)T3f' ) flag++; if ( version == '12.4(24)T3g' ) flag++; if ( version == '12.4(24)T4' ) flag++; if ( version == '12.4(24)T4a' ) flag++; if ( version == '12.4(24)T4b' ) flag++; if ( version == '12.4(24)T4c' ) flag++; if ( version == '12.4(24)T4d' ) flag++; if ( version == '12.4(24)T4e' ) flag++; if ( version == '12.4(24)T4f' ) flag++; if ( version == '12.4(24)T4g' ) flag++; if ( version == '12.4(24)T4h' ) flag++; if ( version == '12.4(24)T4i' ) flag++; if ( version == '12.4(24)T4j' ) flag++; if ( version == '12.4(24)T4k' ) flag++; if ( version == '12.4(24)T4l' ) flag++; if ( version == '12.4(24)T4m' ) flag++; if ( version == '12.4(24)T4n' ) flag++; if ( version == '12.4(24)T5' ) flag++; if ( version == '12.4(24)T6' ) flag++; if ( version == '12.4(24)T7' ) flag++; if ( version == '12.4(24)T8' ) flag++; if ( version == '12.4(24)T9' ) flag++; if ( version == '12.4(24)YE' ) flag++; if ( version == '12.4(24)YE1' ) flag++; if ( version == '12.4(24)YE2' ) flag++; if ( version == '12.4(24)YE3' ) flag++; if ( version == '12.4(24)YE3a' ) flag++; if ( version == '12.4(24)YE3b' ) flag++; if ( version == '12.4(24)YE3c' ) flag++; if ( version == '12.4(24)YE3d' ) flag++; if ( version == '12.4(24)YE3e' ) flag++; if ( version == '12.4(24)YE4' ) flag++; if ( version == '12.4(24)YE5' ) flag++; if ( version == '12.4(24)YE6' ) flag++; if ( version == '12.4(24)YE7' ) flag++; if ( version == '12.4(24)YS' ) flag++; if ( version == '12.4(24)YS1' ) flag++; if ( version == '12.4(25)' ) flag++; if ( version == '12.4(25a)' ) flag++; if ( version == '12.4(25b)' ) flag++; if ( version == '12.4(25c)' ) flag++; if ( version == '12.4(25d)' ) flag++; if ( version == '12.4(25e)' ) flag++; if ( version == '12.4(25f)' ) flag++; if ( version == '12.4(25g)' ) flag++; if ( version == '12.4(3)' ) flag++; if ( version == '12.4(3a)' ) flag++; if ( version == '12.4(3b)' ) flag++; if ( version == '12.4(3c)' ) flag++; if ( version == '12.4(3d)' ) flag++; if ( version == '12.4(3e)' ) flag++; if ( version == '12.4(3f)' ) flag++; if ( version == '12.4(3g)' ) flag++; if ( version == '12.4(3h)' ) flag++; if ( version == '12.4(3i)' ) flag++; if ( version == '12.4(3j)' ) flag++; if ( version == '12.4(4)T' ) flag++; if ( version == '12.4(4)T1' ) flag++; if ( version == '12.4(4)T2' ) flag++; if ( version == '12.4(4)T3' ) flag++; if ( version == '12.4(4)T4' ) flag++; if ( version == '12.4(4)T5' ) flag++; if ( version == '12.4(4)T6' ) flag++; if ( version == '12.4(4)T7' ) flag++; if ( version == '12.4(4)T8' ) flag++; if ( version == '12.4(4)XC' ) flag++; if ( version == '12.4(4)XC1' ) flag++; if ( version == '12.4(4)XC2' ) flag++; if ( version == '12.4(4)XC3' ) flag++; if ( version == '12.4(4)XC4' ) flag++; if ( version == '12.4(4)XC5' ) flag++; if ( version == '12.4(4)XC6' ) flag++; if ( version == '12.4(4)XC7' ) flag++; if ( version == '12.4(4)XD' ) flag++; if ( version == '12.4(4)XD1' ) flag++; if ( version == '12.4(4)XD10' ) flag++; if ( version == '12.4(4)XD11' ) flag++; if ( version == '12.4(4)XD12' ) flag++; if ( version == '12.4(4)XD2' ) flag++; if ( version == '12.4(4)XD3' ) flag++; if ( version == '12.4(4)XD4' ) flag++; if ( version == '12.4(4)XD5' ) flag++; if ( version == '12.4(4)XD6' ) flag++; if ( version == '12.4(4)XD7' ) flag++; if ( version == '12.4(4)XD8' ) flag++; if ( version == '12.4(4)XD9' ) flag++; if ( version == '12.4(5)' ) flag++; if ( version == '12.4(5a)' ) flag++; if ( version == '12.4(5a)M0' ) flag++; if ( version == '12.4(5b)' ) flag++; if ( version == '12.4(5c)' ) flag++; if ( version == '12.4(6)T' ) flag++; if ( version == '12.4(6)T1' ) flag++; if ( version == '12.4(6)T10' ) flag++; if ( version == '12.4(6)T11' ) flag++; if ( version == '12.4(6)T12' ) flag++; if ( version == '12.4(6)T2' ) flag++; if ( version == '12.4(6)T3' ) flag++; if ( version == '12.4(6)T4' ) flag++; if ( version == '12.4(6)T5' ) flag++; if ( version == '12.4(6)T5a' ) flag++; if ( version == '12.4(6)T5b' ) flag++; if ( version == '12.4(6)T5c' ) flag++; if ( version == '12.4(6)T5e' ) flag++; if ( version == '12.4(6)T5f' ) flag++; if ( version == '12.4(6)T6' ) flag++; if ( version == '12.4(6)T7' ) flag++; if ( version == '12.4(6)T8' ) flag++; if ( version == '12.4(6)T9' ) flag++; if ( version == '12.4(6)XE' ) flag++; if ( version == '12.4(6)XE1' ) flag++; if ( version == '12.4(6)XE2' ) flag++; if ( version == '12.4(6)XE3' ) flag++; if ( version == '12.4(6)XT' ) flag++; if ( version == '12.4(6)XT1' ) flag++; if ( version == '12.4(6)XT2' ) flag++; if ( version == '12.4(7)' ) flag++; if ( version == '12.4(7a)' ) flag++; if ( version == '12.4(7b)' ) flag++; if ( version == '12.4(7c)' ) flag++; if ( version == '12.4(7d)' ) flag++; if ( version == '12.4(7e)' ) flag++; if ( version == '12.4(7f)' ) flag++; if ( version == '12.4(7g)' ) flag++; if ( version == '12.4(7h)' ) flag++; if ( version == '12.4(8)' ) flag++; if ( version == '12.4(8a)' ) flag++; if ( version == '12.4(8b)' ) flag++; if ( version == '12.4(8c)' ) flag++; if ( version == '12.4(8d)' ) flag++; if ( version == '12.4(9)T' ) flag++; if ( version == '12.4(9)T0a' ) flag++; if ( version == '12.4(9)T1' ) flag++; if ( version == '12.4(9)T2' ) flag++; if ( version == '12.4(9)T3' ) flag++; if ( version == '12.4(9)T4' ) flag++; if ( version == '12.4(9)T5' ) flag++; if ( version == '12.4(9)T6' ) flag++; if ( version == '12.4(9)T7' ) flag++; if ( version == '15.0(1)M' ) flag++; if ( version == '15.0(1)M1' ) flag++; if ( version == '15.0(1)M10' ) flag++; if ( version == '15.0(1)M2' ) flag++; if ( version == '15.0(1)M3' ) flag++; if ( version == '15.0(1)M4' ) flag++; if ( version == '15.0(1)M5' ) flag++; if ( version == '15.0(1)M6' ) flag++; if ( version == '15.0(1)M6a' ) flag++; if ( version == '15.0(1)M7' ) flag++; if ( version == '15.0(1)M8' ) flag++; if ( version == '15.0(1)M9' ) flag++; if ( version == '15.0(1)XA' ) flag++; if ( version == '15.0(1)XA1' ) flag++; if ( version == '15.0(1)XA2' ) flag++; if ( version == '15.0(1)XA3' ) flag++; if ( version == '15.0(1)XA4' ) flag++; if ( version == '15.0(1)XA5' ) flag++; if ( version == '15.1(1)T' ) flag++; if ( version == '15.1(1)T1' ) flag++; if ( version == '15.1(1)T2' ) flag++; if ( version == '15.1(1)T3' ) flag++; if ( version == '15.1(1)T4' ) flag++; if ( version == '15.1(1)T5' ) flag++; if ( version == '15.1(1)XB' ) flag++; if ( version == '15.1(1)XB1' ) flag++; if ( version == '15.1(1)XB2' ) flag++; if ( version == '15.1(1)XB3' ) flag++; if ( version == '15.1(2)GC' ) flag++; if ( version == '15.1(2)GC1' ) flag++; if ( version == '15.1(2)GC2' ) flag++; if ( version == '15.1(2)T' ) flag++; if ( version == '15.1(2)T0a' ) flag++; if ( version == '15.1(2)T1' ) flag++; if ( version == '15.1(2)T2' ) flag++; if ( version == '15.1(2)T2a' ) flag++; if ( version == '15.1(2)T3' ) flag++; if ( version == '15.1(2)T4' ) flag++; if ( version == '15.1(2)T5' ) flag++; if ( version == '15.1(3)T' ) flag++; if ( version == '15.1(3)T1' ) flag++; if ( version == '15.1(3)T2' ) flag++; if ( version == '15.1(3)T3' ) flag++; if ( version == '15.1(3)T4' ) flag++; if ( version == '15.1(4)GC' ) flag++; if ( version == '15.1(4)GC1' ) flag++; if ( version == '15.1(4)M' ) flag++; if ( version == '15.1(4)M0a' ) flag++; if ( version == '15.1(4)M0b' ) flag++; if ( version == '15.1(4)M1' ) flag++; if ( version == '15.1(4)M2' ) flag++; if ( version == '15.1(4)M3' ) flag++; if ( version == '15.1(4)M3a' ) flag++; if ( version == '15.1(4)M4' ) flag++; if ( version == '15.1(4)M5' ) flag++; if ( version == '15.1(4)M6' ) flag++; if ( version == '15.1(4)XB4' ) flag++; if ( version == '15.1(4)XB5' ) flag++; if ( version == '15.1(4)XB5a' ) flag++; if ( version == '15.1(4)XB6' ) flag++; if ( version == '15.1(4)XB7' ) flag++; if ( version == '15.1(4)XB8a' ) flag++; if ( version == '15.2(1)GC' ) flag++; if ( version == '15.2(1)GC1' ) flag++; if ( version == '15.2(1)GC2' ) flag++; if ( version == '15.2(1)T' ) flag++; if ( version == '15.2(1)T1' ) flag++; if ( version == '15.2(1)T2' ) flag++; if ( version == '15.2(1)T3' ) flag++; if ( version == '15.2(1)T3a' ) flag++; if ( version == '15.2(1)T4' ) flag++; if ( version == '15.2(2)GC' ) flag++; if ( version == '15.2(2)T' ) flag++; if ( version == '15.2(2)T1' ) flag++; if ( version == '15.2(2)T2' ) flag++; if ( version == '15.2(2)T3' ) flag++; if ( version == '15.2(3)GC' ) flag++; if ( version == '15.2(3)GCA' ) flag++; if ( version == '15.2(3)T' ) flag++; if ( version == '15.2(3)T1' ) flag++; if ( version == '15.2(3)T2' ) flag++; if ( version == '15.2(3)XA' ) flag++; if ( version == '15.2(4)M' ) flag++; if ( version == '15.2(4)M1' ) flag++; if ( version == '15.2(4)M2' ) flag++; if ( version == '15.2(4)M3' ) flag++; if ( version == '15.2(4)XB10' ) flag++; if ( version == '15.3(1)T' ) flag++; if (get_kb_item("Host/local_checks_enabled")) { if (flag) { flag = 0; buf = cisco_command_kb_item("Host/Cisco/Config/show_ipv6_virtual-reassembly", "show ipv6 virtual-reassembly"); if (check_cisco_result(buf)) { if (preg(pattern:"ENABLED\s[\[\(]in[\]\)]\r\n(.\r\n){1,5} *[Dd]rop fragments: OFF", multiline:TRUE, string:buf)) { flag = 1; } } else if (cisco_needs_enable(buf)) { flag = 1; override = 1; } } } if (flag) { security_hole(port:0, extra:cisco_caveat(override)); exit(0); } else audit(AUDIT_HOST_NOT, "affected");

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ipv6vfr