var-200505-1328
Vulnerability from variot
Certain TCP implementations may allow a remote attacker to arbitrarily modify host timestamp values, leading to a denial-of-service condition. A denial-of-service vulnerability exists for the TCP RFC 1323. The issue resides in the Protection Against Wrapped Sequence Numbers (PAWS) technique that was included to increase overall TCP performance. When TCP 'timestamps' are enabled, both hosts at the endpoints of a TCP connection employ internal clocks to mark TCP headers with a 'timestamp' value. The issue manifests if an attacker transmits a sufficient TCP PAWS packet to a vulnerable computer. The attacker sets a large value as the packet timestamp. When the target computer processes this packet, the internal timer is updated to the large value that the attacker supplied. This causes all other valid packets that are received subsequent to an attack to be dropped, because they are deemed to be too old or invalid. This type of attack will effectively deny service for a target connection. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
============================================================================= FreeBSD-SA-05:15.tcp Security Advisory The FreeBSD Project
Topic: TCP connection stall denial of service
Category: core Module: inet Announced: 2005-06-29 Credits: Noritoshi Demizu Affects: All FreeBSD releases. Corrected: 2005-06-29 21:38:48 UTC (RELENG_5, 5.4-STABLE) 2005-06-29 21:41:03 UTC (RELENG_5_4, 5.4-RELEASE-p3) 2005-06-29 21:42:33 UTC (RELENG_5_3, 5.3-RELEASE-p17) 2005-06-29 21:43:42 UTC (RELENG_4, 4.11-STABLE) 2005-06-29 21:45:14 UTC (RELENG_4_11, 4.11-RELEASE-p11) 2005-06-29 21:46:15 UTC (RELENG_4_10, 4.10-RELEASE-p16) CVE Name: CAN-2005-0356, CAN-2005-2068
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
I. Background
The Transmission Control Protocol (TCP) of the TCP/IP protocol suite provides a connection-oriented, reliable, sequence-preserving data stream service. TCP packets with the SYN flag set are used during setup of new TCP connections.
II. Problem Description
Two problems have been discovered in the FreeBSD TCP stack.
First, when a TCP packets containing a timestamp is received, inadequate checking of sequence numbers is performed, allowing an attacker to artificially increase the internal "recent" timestamp for a connection.
Second, a TCP packet with the SYN flag set is accepted for established connections, allowing an attacker to overwrite certain TCP options.
III. Impact
Using either of the two problems an attacker with knowledge of the local and remote IP and port numbers associated with a connection can cause a denial of service situation by stalling the TCP connection. The stalled TCP connection my be closed after some time by the other host.
IV. Workaround
In some cases it may be possible to defend against these attacks by blocking the attack packets using a firewall. Packets used to effect either of these attacks would have spoofed source IP addresses.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the RELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 4.10, 4.11, 5.3, and 5.4 systems.
a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
[FreeBSD 4.x]
fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch
fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch.asc
[FreeBSD 5.x]
fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch
fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch.asc
b) Apply the patch.
cd /usr/src
patch < /path/to/patch
c) Recompile your kernel as described in
VI. Correction details
The following list contains the revision numbers of each file that was corrected in FreeBSD.
Branch Revision Path
RELENG_4 src/sys/netinet/tcp_input.c 1.107.2.44 RELENG_4_11 src/UPDATING 1.73.2.91.2.12 src/sys/conf/newvers.sh 1.44.2.39.2.15 src/sys/netinet/tcp_input.c 1.107.2.41.4.3 RELENG_4_10 src/UPDATING 1.73.2.90.2.17 src/sys/conf/newvers.sh 1.44.2.34.2.18 src/sys/netinet/tcp_input.c 1.107.2.41.2.1 RELENG_5 src/sys/netinet/tcp_input.c 1.252.2.16 RELENG_5_4 src/UPDATING 1.342.2.24.2.12 src/sys/conf/newvers.sh 1.62.2.18.2.8 src/sys/netinet/tcp_input.c 1.252.2.14.2.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.20 src/sys/conf/newvers.sh 1.62.2.15.2.22 src/sys/netinet/tcp_input.c 1.252.4.1
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0356 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2068 http://www.kb.cert.org/vuls/id/637934
The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:15.tcp.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD)
iD8DBQFCwxe7FdaIBMps37IRAi39AJ9ss6PVEwloS4SlKEWi5S1hpHnzmACeJF7H rKmK2NtleJ98dTLWW4QLMn4= =6fBH -----END PGP SIGNATURE----- .
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TITLE: Cisco Various Products TCP Timestamp Denial of Service
SECUNIA ADVISORY ID: SA15393
VERIFY ADVISORY: http://secunia.com/advisories/15393/
CRITICAL: Less critical
IMPACT: DoS
WHERE:
From remote
OPERATING SYSTEM: Cisco SN5400 Series Storage Routers http://secunia.com/product/2188/ Cisco MGX 8900 Series Multiservice Switches http://secunia.com/product/5117/ Cisco MGX 8800 Series Multiservice Switches http://secunia.com/product/5116/ Cisco MGX 8200 Series Edge Concentrators http://secunia.com/product/5115/ Cisco Content Services Switch 11000 Series (WebNS) http://secunia.com/product/1507/ Cisco Aironet 350 Series Access Point http://secunia.com/product/5114/ Cisco Aironet 1200 Series Access Point http://secunia.com/product/1929/
DESCRIPTION: A vulnerability has been reported in some Cisco products, which can be exploited by malicious people to cause a DoS (Denial of Service) on active TCP sessions.
The vulnerability is caused due to an error in the implementation of the TCP Timestamp option and can be exploited via specially crafted packets to cause a targeted TCP session to stall until it's reset.
Successful exploitation requires knowledge of IP address information of the source and destination of the TCP network connection.
The vulnerability affects the following products: * SN5400 series storage routers * CSS11000 series content services switches * AP350 and AP1200 series Access Points running VxWorks * MGX8200, MGX8800, and MGX8900 series WAN switches (only management interfaces)
SOLUTION: SN5400 series storage routers: The vulnerability has been addressed by CSCin85370.
CSS11000 series content services switches: The vulnerability has been addressed by CSCeh40395.
AP350 and AP1200 series Access Points: The vendor recommends upgrading APs running VxWorks to Cisco IOS.
MGX series WAN switches: The vulnerability has been documented by CSCeh85125 and CSCeh85130.
PROVIDED AND/OR DISCOVERED BY: US-CERT credits Noritoshi Demizu.
ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sn-20050518-tcpts.shtml
OTHER REFERENCES: US-CERT VU#637934: http://www.kb.cert.org/vuls/id/637934
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/secunia_security_advisories/
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.
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.
For more information: SA14904
SOLUTION: Apply updated packages.
For more information: SA15393
The vulnerability affects all versions of CacheOS and SGOS.
SOLUTION: The vendor recommends disabling RFC1323 support until a patch is available
Show details on source website{
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"data": "Certain TCP implementations may allow a remote attacker to arbitrarily modify host timestamp values, leading to a denial-of-service condition. A denial-of-service vulnerability exists for the TCP RFC 1323. The issue resides in the Protection Against Wrapped Sequence Numbers (PAWS) technique that was included to increase overall TCP performance. \nWhen TCP \u0027timestamps\u0027 are enabled, both hosts at the endpoints of a TCP connection employ internal clocks to mark TCP headers with a \u0027timestamp\u0027 value. \nThe issue manifests if an attacker transmits a sufficient TCP PAWS packet to a vulnerable computer. The attacker sets a large value as the packet timestamp. When the target computer processes this packet, the internal timer is updated to the large value that the attacker supplied. This causes all other valid packets that are received subsequent to an attack to be dropped, because they are deemed to be too old or invalid. This type of attack will effectively deny service for a target connection. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=============================================================================\nFreeBSD-SA-05:15.tcp Security Advisory\n The FreeBSD Project\n\nTopic: TCP connection stall denial of service\n\nCategory: core\nModule: inet\nAnnounced: 2005-06-29\nCredits: Noritoshi Demizu\nAffects: All FreeBSD releases. \nCorrected: 2005-06-29 21:38:48 UTC (RELENG_5, 5.4-STABLE)\n 2005-06-29 21:41:03 UTC (RELENG_5_4, 5.4-RELEASE-p3)\n 2005-06-29 21:42:33 UTC (RELENG_5_3, 5.3-RELEASE-p17)\n 2005-06-29 21:43:42 UTC (RELENG_4, 4.11-STABLE)\n 2005-06-29 21:45:14 UTC (RELENG_4_11, 4.11-RELEASE-p11)\n 2005-06-29 21:46:15 UTC (RELENG_4_10, 4.10-RELEASE-p16)\nCVE Name: CAN-2005-0356, CAN-2005-2068\n\nFor general information regarding FreeBSD Security Advisories,\nincluding descriptions of the fields above, security branches, and the\nfollowing sections, please visit\n\u003cURL:http://www.freebsd.org/security/\u003e. \n\nI. Background\n\nThe Transmission Control Protocol (TCP) of the TCP/IP protocol suite\nprovides a connection-oriented, reliable, sequence-preserving data\nstream service. TCP\npackets with the SYN flag set are used during setup of new TCP\nconnections. \n\nII. Problem Description\n\nTwo problems have been discovered in the FreeBSD TCP stack. \n\nFirst, when a TCP packets containing a timestamp is received, inadequate\nchecking of sequence numbers is performed, allowing an attacker to\nartificially increase the internal \"recent\" timestamp for a connection. \n\nSecond, a TCP packet with the SYN flag set is accepted for established\nconnections, allowing an attacker to overwrite certain TCP options. \n\nIII. Impact\n\nUsing either of the two problems an attacker with knowledge of the\nlocal and remote IP and port numbers associated with a connection\ncan cause a denial of service situation by stalling the TCP connection. \nThe stalled TCP connection my be closed after some time by the other\nhost. \n\nIV. Workaround\n\nIn some cases it may be possible to defend against these attacks by\nblocking the attack packets using a firewall. Packets used to effect\neither of these attacks would have spoofed source IP addresses. \n\nV. Solution\n\nPerform one of the following:\n\n1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the\nRELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch\ndated after the correction date. \n\n2) To patch your present system:\n\nThe following patches have been verified to apply to FreeBSD 4.10,\n4.11, 5.3, and 5.4 systems. \n\na) Download the relevant patch from the location below, and verify the\ndetached PGP signature using your PGP utility. \n\n[FreeBSD 4.x]\n# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch\n# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch.asc\n\n[FreeBSD 5.x]\n# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch\n# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch.asc\n\nb) Apply the patch. \n\n# cd /usr/src\n# patch \u003c /path/to/patch\n\nc) Recompile your kernel as described in\n\u003cURL:http://www.freebsd.org/handbook/kernelconfig.html\u003e and reboot the\nsystem. \n\nVI. Correction details\n\nThe following list contains the revision numbers of each file that was\ncorrected in FreeBSD. \n\nBranch Revision\n Path\n- -------------------------------------------------------------------------\nRELENG_4\n src/sys/netinet/tcp_input.c 1.107.2.44\nRELENG_4_11\n src/UPDATING 1.73.2.91.2.12\n src/sys/conf/newvers.sh 1.44.2.39.2.15\n src/sys/netinet/tcp_input.c 1.107.2.41.4.3\nRELENG_4_10\n src/UPDATING 1.73.2.90.2.17\n src/sys/conf/newvers.sh 1.44.2.34.2.18\n src/sys/netinet/tcp_input.c 1.107.2.41.2.1\nRELENG_5\n src/sys/netinet/tcp_input.c 1.252.2.16\nRELENG_5_4\n src/UPDATING 1.342.2.24.2.12\n src/sys/conf/newvers.sh 1.62.2.18.2.8\n src/sys/netinet/tcp_input.c 1.252.2.14.2.1\nRELENG_5_3\n src/UPDATING 1.342.2.13.2.20\n src/sys/conf/newvers.sh 1.62.2.15.2.22\n src/sys/netinet/tcp_input.c 1.252.4.1\n- -------------------------------------------------------------------------\n\nVII. References\n\nhttp://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0356\nhttp://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2068\nhttp://www.kb.cert.org/vuls/id/637934\n\nThe latest revision of this advisory is available at\nftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:15.tcp.asc\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.1 (FreeBSD)\n\niD8DBQFCwxe7FdaIBMps37IRAi39AJ9ss6PVEwloS4SlKEWi5S1hpHnzmACeJF7H\nrKmK2NtleJ98dTLWW4QLMn4=\n=6fBH\n-----END PGP SIGNATURE-----\n. \n\n----------------------------------------------------------------------\n\nBist Du interessiert an einem neuen Job in IT-Sicherheit?\n\n\nSecunia hat zwei freie Stellen als Junior und Senior Spezialist in IT-\nSicherheit:\nhttp://secunia.com/secunia_vacancies/\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco Various Products TCP Timestamp Denial of Service\n\nSECUNIA ADVISORY ID:\nSA15393\n\nVERIFY ADVISORY:\nhttp://secunia.com/advisories/15393/\n\nCRITICAL:\nLess critical\n\nIMPACT:\nDoS\n\nWHERE:\n\u003eFrom remote\n\nOPERATING SYSTEM:\nCisco SN5400 Series Storage Routers\nhttp://secunia.com/product/2188/\nCisco MGX 8900 Series Multiservice Switches\nhttp://secunia.com/product/5117/\nCisco MGX 8800 Series Multiservice Switches\nhttp://secunia.com/product/5116/\nCisco MGX 8200 Series Edge Concentrators\nhttp://secunia.com/product/5115/\nCisco Content Services Switch 11000 Series (WebNS)\nhttp://secunia.com/product/1507/\nCisco Aironet 350 Series Access Point\nhttp://secunia.com/product/5114/\nCisco Aironet 1200 Series Access Point\nhttp://secunia.com/product/1929/\n\nDESCRIPTION:\nA vulnerability has been reported in some Cisco products, which can\nbe exploited by malicious people to cause a DoS (Denial of Service)\non active TCP sessions. \n\nThe vulnerability is caused due to an error in the implementation of\nthe TCP Timestamp option and can be exploited via specially crafted\npackets to cause a targeted TCP session to stall until it\u0027s reset. \n\nSuccessful exploitation requires knowledge of IP address information\nof the source and destination of the TCP network connection. \n\nThe vulnerability affects the following products:\n* SN5400 series storage routers\n* CSS11000 series content services switches\n* AP350 and AP1200 series Access Points running VxWorks\n* MGX8200, MGX8800, and MGX8900 series WAN switches (only management\ninterfaces)\n\nSOLUTION:\nSN5400 series storage routers:\nThe vulnerability has been addressed by CSCin85370. \n\nCSS11000 series content services switches:\nThe vulnerability has been addressed by CSCeh40395. \n\nAP350 and AP1200 series Access Points:\nThe vendor recommends upgrading APs running VxWorks to Cisco IOS. \n\nMGX series WAN switches:\nThe vulnerability has been documented by CSCeh85125 and CSCeh85130. \n\nPROVIDED AND/OR DISCOVERED BY:\nUS-CERT credits Noritoshi Demizu. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sn-20050518-tcpts.shtml\n\nOTHER REFERENCES:\nUS-CERT VU#637934:\nhttp://www.kb.cert.org/vuls/id/637934\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n. \n\nFor more information:\nSA14904\n\nSOLUTION:\nApply updated packages. \n\nFor more information:\nSA15393\n\nThe vulnerability affects all versions of CacheOS and SGOS. \n\nSOLUTION:\nThe vendor recommends disabling RFC1323 support until a patch is\navailable",
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.