var-200212-0627
Vulnerability from variot
Multiple SSH2 servers and clients do not properly handle strings with null characters in them when the string length is specified by a length field, which could allow remote attackers to cause a denial of service or possibly execute arbitrary code due to interactions with the use of null-terminated strings as implemented using languages such as C, as demonstrated by the SSHredder SSH protocol test suite. Secure shell (SSH) transport layer protocol implementations from different vendors contain multiple vulnerabilities in code that handles key exchange and initialization. Both SSH servers and clients are affected. ------------ This vulnerability information is a summary of multiple vulnerabilities released at the same time. Please note that the contents of vulnerability information other than the title are included. ------------ TCP/IP Used by higher layers SSH The transport layer protocol is SSH This is the protocol that forms the basis of the entire protocol. Key exchange, encryption technology to be used, message authentication algorithm, etc. have been agreed, and functions such as encrypted data transfer and server authentication are provided. Provided by many vendors SSH There is a deficiency in the implementation method in products that implement the protocol. Remote attackers are responsible for various malicious packets that are handled during the initial setup, key exchange, and connection phase related to this protocol. ( Packet length padding Packets with unusual lengths, packets with malformed character strings or values inserted, packets for which the algorithm is not properly defined, etc. ) By sending SSH Cause a server or client to go out of service, and SSH It is possible to execute arbitrary code with the execution authority of the server or client. However, the impact of this issue is provided by each vendor SSH It depends on the product. Details are currently unknown, SSH Communications Security Provided by SSH Secure Shell in the case of, SSH It can lead to server child processes or client crashes. Also F-Secure of F-Secure SSH In the case of, SSH If you use both products as a result, it may cause the server child process to crash, SSH The connection between the server and client may be lost. However, the client can connect by trying to reconnect. At this time, SSH Secure Shell and F-Secure SSH of Windows The effect of the edition is unknown. OpenSSH Is not affected by this issue. Cisco IOS In the case of SSH Because the server is disabled, the default setting is not affected by this issue.Please refer to the “Overview” for the impact of this vulnerability. Multiple vendor SSH2 implementations are reported to be prone to issues related to the handling of null characters in strings. These issues may be used to cause unpredictable behavior to occur, such as a denial of service or memory corruption. It is reportedly possible to trigger these conditions prior to authentication. These conditions were discovered during tests of the initialization, key exchange, and negotiation phases (KEX, KEXINIT) of a SSH2 transaction between client and server. These issues are known to affect various client and server implementations of the protocol. Further details about this vulnerability are currently unknown. This BID will be updated as more information becomes available. This vulnerability was originally described in BugTraq ID 6397.
-----BEGIN PGP SIGNED MESSAGE-----
CERT Advisory CA-2002-36 Multiple Vulnerabilities in SSH Implementations
Original issue date: December 16, 2002 Last revised: -- Source: CERT/CC
A complete revision history is at the end of this file.
I. It provides strong encryption, cryptographic host authentication, and integrity protection.... These vulnerabilities include buffer overflows, and they occur before any user authentication takes place. SSHredder was primarily designed to test key exchange and other processes that are specific to version 2 of the SSH protocol; however, certain classes of tests are also applicable to version 1.
Rapid7 has published a detailed advisory (R7-0009) and the SSHredder test suite.
Common Vulnerabilities and Exposures (CVE) has assigned the following candidate numbers for several classes of tests performed by SSHredder:
* CAN-2002-1357 - incorrect field lengths
* CAN-2002-1358 - lists with empty elements or multiple separators
* CAN-2002-1359 - "classic" buffer overflows
* CAN-2002-1360 - null characters in strings
II. On Microsoft Windows systems, SSH servers commonly run with SYSTEM privileges, and on UNIX systems, SSH daemons typically run with root privileges.
III. Solution
Apply a patch or upgrade
Apply the appropriate patch or upgrade as specified by your vendor. See Appendix A below and the Systems Affected section of VU#389665 for specific information.
Restrict access
Limit access to SSH servers to trusted hosts and networks using firewalls or other packet-filtering systems. Some SSH servers may have the ability to restrict access based on IP addresses, or similar effects may be achieved by using TCP wrappers or other related technology.
SSH clients can reduce the risk of attacks by only connecting to trusted servers by IP address.
While these workarounds will not prevent exploitation of these vulnerabilities, they will make attacks somewhat more difficult, in part by limiting the number of potential sources of attacks.
Appendix A. Vendor Information
This appendix contains information provided by vendors. When vendors report new information, this section is updated and the changes are noted in the revision history. If a vendor is not listed below, we have not received their comments. The Systems Affected section of VU#389665 contains additional vendor status information.
Cisco Systems, Inc.
The official statement regarding this is that we are not
vulnerable.
Cray Inc.
Cray Inc. supports the OpenSSH product through their Cray Open
Software (COS) package. COS 3.3, available the end of December
2002, is not vulnerable. If a site is concerned, they can contact
their local Cray representive to obtain an early copy of the
OpenSSH contained in COS 3.3.
F-Secure
F-Secure SSH products are not exploitable via these attacks. While
F-Secure SSH versions 3.1.0 build 11 and earlier crash on these
malicious packets, we did not find ways to exploit this to gain
unauthorized access or to run arbitrary code. Furthermore, the
crash occurs in a forked process so the denial of service attacks
are not possible.
Fujitsu
Fujitsu's UXP/V OS is not vulnerable because it does not support
SSH.
IBM
IBM's AIX is not vulnerabible to the issues discussed in CERT
Vulnerability Note VU#389665.
lsh
I've now tried the testsuite with the latest stable release of lsh,
lsh-1.4.2. Both the client and the server seem NOT VULNERABLE.
NetScreen Technologies Inc.
Tested latest versions. Not Vulnerable.
OpenSSH
From my testing it seems that the current version of OpenSSH (3.5)
is not vulnerable to these problems, and some limited testing shows
that no version of OpenSSH is vulnerable.
Pragma Systems, Inc.
December 16, 2002
Rapid 7 and CERT Coordination Center Vulnerability report VU#389665
Pragma Systems Inc. of Austin, Texas, USA, was notified regarding a
possible vulnerability with Version 2.0 of Pragma SecureShell.
Pragma Systems tested Pragma SecureShell 2.0 and the upcoming new
Version 3.0, and found that the attacks did cause a memory access
protection fault on Microsoft platforms.
After research, Pragma Systems corrected the problem.
The problem is corrected in Pragma SecureShell Version 3.0. Any
customers with concerns regarding this vulnerability report should
contact Pragma Systems, Inc at support@pragmasys.com for
information on obtaining an upgrade free of charge. Pragma's web
site is located at www.pragmasys.com and the company can be reached
at 1-512-219-7270.
PuTTY
PuTTY 0.53b addresses vulnerabilities discovered by SSHredder.
Appendix B. References
* CERT/CC Vulnerability Note: VU#389665 -
http://www.kb.cert.org/vuls/id/389665
* Rapid 7 Advisory: R7-0009 -
http://www.rapid7.com/advisories/R7-0009.txt
* Rapid 7 SSHredder test suite -
http://www.rapid7.com/perl/DownloadRequest.pl?PackageChoice=666
* IETF Draft: SSH Transport Layer Protocol -
http://www.ietf.org/internet-drafts/draft-ietf-secsh-transport-15.
txt
* IETF Draft: SSH Protocol Architecture -
http://www.ietf.org/internet-drafts/draft-ietf-secsh-architecture-
13.txt
* Privilege Separated OpenSSH -
http://www.citi.umich.edu/u/provos/ssh/privsep.html
_________________________________________________________________
The CERT Coordination Center thanks Rapid7 for researching and reporting these vulnerabilities. ___________
Author: Art Manion.
This document is available from: http://www.cert.org/advisories/CA-2002-36.html
CERT/CC Contact Information
Email: cert@cert.org Phone: +1 412-268-7090 (24-hour hotline) Fax: +1 412-268-6989 Postal address: CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 U.S.A.
CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends.
Using encryption
We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from http://www.cert.org/CERT_PGP.key
If you prefer to use DES, please call the CERT hotline for more information.
Getting security information
CERT publications and other security information are available from our web site http://www.cert.org/
To subscribe to the CERT mailing list for advisories and bulletins, send email to majordomo@cert.org. Please include in the body of your message
subscribe cert-advisory
- "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office.
NO WARRANTY Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement. ___________
Conditions for use, disclaimers, and sponsorship information
Copyright 2002 Carnegie Mellon University.
Revision History
December 16, 2002: Initial release
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"data": "Multiple SSH2 servers and clients do not properly handle strings with null characters in them when the string length is specified by a length field, which could allow remote attackers to cause a denial of service or possibly execute arbitrary code due to interactions with the use of null-terminated strings as implemented using languages such as C, as demonstrated by the SSHredder SSH protocol test suite. Secure shell (SSH) transport layer protocol implementations from different vendors contain multiple vulnerabilities in code that handles key exchange and initialization. Both SSH servers and clients are affected. ------------ This vulnerability information is a summary of multiple vulnerabilities released at the same time. Please note that the contents of vulnerability information other than the title are included. ------------ TCP/IP Used by higher layers SSH The transport layer protocol is SSH This is the protocol that forms the basis of the entire protocol. Key exchange, encryption technology to be used, message authentication algorithm, etc. have been agreed, and functions such as encrypted data transfer and server authentication are provided. Provided by many vendors SSH There is a deficiency in the implementation method in products that implement the protocol. Remote attackers are responsible for various malicious packets that are handled during the initial setup, key exchange, and connection phase related to this protocol. ( Packet length padding Packets with unusual lengths, packets with malformed character strings or values inserted, packets for which the algorithm is not properly defined, etc. ) By sending SSH Cause a server or client to go out of service, and SSH It is possible to execute arbitrary code with the execution authority of the server or client. However, the impact of this issue is provided by each vendor SSH It depends on the product. Details are currently unknown, SSH Communications Security Provided by SSH Secure Shell in the case of, SSH It can lead to server child processes or client crashes. Also F-Secure of F-Secure SSH In the case of, SSH If you use both products as a result, it may cause the server child process to crash, SSH The connection between the server and client may be lost. However, the client can connect by trying to reconnect. At this time, SSH Secure Shell and F-Secure SSH of Windows The effect of the edition is unknown. OpenSSH Is not affected by this issue. Cisco IOS In the case of SSH Because the server is disabled, the default setting is not affected by this issue.Please refer to the \u201cOverview\u201d for the impact of this vulnerability. Multiple vendor SSH2 implementations are reported to be prone to issues related to the handling of null characters in strings. These issues may be used to cause unpredictable behavior to occur, such as a denial of service or memory corruption. It is reportedly possible to trigger these conditions prior to authentication. \nThese conditions were discovered during tests of the initialization, key exchange, and negotiation phases (KEX, KEXINIT) of a SSH2 transaction between client and server. These issues are known to affect various client and server implementations of the protocol. \nFurther details about this vulnerability are currently unknown. This BID will be updated as more information becomes available. This vulnerability was originally described in BugTraq ID 6397. \n\n-----BEGIN PGP SIGNED MESSAGE-----\n\n\nCERT Advisory CA-2002-36 Multiple Vulnerabilities in SSH Implementations\n\n Original issue date: December 16, 2002\n Last revised: --\n Source: CERT/CC\n\n A complete revision history is at the end of this file. \n\n\nI. \n It provides strong encryption, cryptographic host authentication,\n and integrity protection.... These vulnerabilities include buffer\n overflows, and they occur before any user authentication takes place. \n SSHredder was primarily designed to test key exchange and other\n processes that are specific to version 2 of the SSH protocol; however,\n certain classes of tests are also applicable to version 1. \n\n Rapid7 has published a detailed advisory (R7-0009) and the SSHredder\n test suite. \n\n Common Vulnerabilities and Exposures (CVE) has assigned the following\n candidate numbers for several classes of tests performed by SSHredder:\n\n * CAN-2002-1357 - incorrect field lengths\n * CAN-2002-1358 - lists with empty elements or multiple separators\n * CAN-2002-1359 - \"classic\" buffer overflows\n * CAN-2002-1360 - null characters in strings\n\n\nII. On\n Microsoft Windows systems, SSH servers commonly run with SYSTEM\n privileges, and on UNIX systems, SSH daemons typically run with root\n privileges. \n\n\nIII. Solution\n\nApply a patch or upgrade\n\n Apply the appropriate patch or upgrade as specified by your vendor. \n See Appendix A below and the Systems Affected section of VU#389665 for\n specific information. \n\nRestrict access\n\n Limit access to SSH servers to trusted hosts and networks using\n firewalls or other packet-filtering systems. Some SSH servers may have\n the ability to restrict access based on IP addresses, or similar\n effects may be achieved by using TCP wrappers or other related\n technology. \n\n SSH clients can reduce the risk of attacks by only connecting to\n trusted servers by IP address. \n\n While these workarounds will not prevent exploitation of these\n vulnerabilities, they will make attacks somewhat more difficult, in\n part by limiting the number of potential sources of attacks. \n\n\nAppendix A. Vendor Information\n\n This appendix contains information provided by vendors. When vendors\n report new information, this section is updated and the changes are\n noted in the revision history. If a vendor is not listed below, we\n have not received their comments. The Systems Affected section of\n VU#389665 contains additional vendor status information. \n\nCisco Systems, Inc. \n\n The official statement regarding this is that we are not\n vulnerable. \n\nCray Inc. \n\n Cray Inc. supports the OpenSSH product through their Cray Open\n Software (COS) package. COS 3.3, available the end of December\n 2002, is not vulnerable. If a site is concerned, they can contact\n their local Cray representive to obtain an early copy of the\n OpenSSH contained in COS 3.3. \n\nF-Secure\n\n F-Secure SSH products are not exploitable via these attacks. While\n F-Secure SSH versions 3.1.0 build 11 and earlier crash on these\n malicious packets, we did not find ways to exploit this to gain\n unauthorized access or to run arbitrary code. Furthermore, the\n crash occurs in a forked process so the denial of service attacks\n are not possible. \n\nFujitsu\n\n Fujitsu\u0027s UXP/V OS is not vulnerable because it does not support\n SSH. \n\nIBM\n\n IBM\u0027s AIX is not vulnerabible to the issues discussed in CERT\n Vulnerability Note VU#389665. \n\nlsh\n\n I\u0027ve now tried the testsuite with the latest stable release of lsh,\n lsh-1.4.2. Both the client and the server seem NOT VULNERABLE. \n\nNetScreen Technologies Inc. \n\n Tested latest versions. Not Vulnerable. \n\nOpenSSH\n\n From my testing it seems that the current version of OpenSSH (3.5)\n is not vulnerable to these problems, and some limited testing shows\n that no version of OpenSSH is vulnerable. \n\nPragma Systems, Inc. \n\n December 16, 2002\n\n Rapid 7 and CERT Coordination Center Vulnerability report VU#389665\n\n Pragma Systems Inc. of Austin, Texas, USA, was notified regarding a\n possible vulnerability with Version 2.0 of Pragma SecureShell. \n Pragma Systems tested Pragma SecureShell 2.0 and the upcoming new\n Version 3.0, and found that the attacks did cause a memory access\n protection fault on Microsoft platforms. \n\n After research, Pragma Systems corrected the problem. \n\n The problem is corrected in Pragma SecureShell Version 3.0. Any\n customers with concerns regarding this vulnerability report should\n contact Pragma Systems, Inc at support@pragmasys.com for\n information on obtaining an upgrade free of charge. Pragma\u0027s web\n site is located at www.pragmasys.com and the company can be reached\n at 1-512-219-7270. \n\nPuTTY\n\n PuTTY 0.53b addresses vulnerabilities discovered by SSHredder. \n\n\nAppendix B. References\n\n * CERT/CC Vulnerability Note: VU#389665 -\n http://www.kb.cert.org/vuls/id/389665\n * Rapid 7 Advisory: R7-0009 -\n http://www.rapid7.com/advisories/R7-0009.txt\n * Rapid 7 SSHredder test suite -\n http://www.rapid7.com/perl/DownloadRequest.pl?PackageChoice=666\n * IETF Draft: SSH Transport Layer Protocol -\n http://www.ietf.org/internet-drafts/draft-ietf-secsh-transport-15. \n txt\n * IETF Draft: SSH Protocol Architecture -\n http://www.ietf.org/internet-drafts/draft-ietf-secsh-architecture-\n 13.txt\n * Privilege Separated OpenSSH -\n http://www.citi.umich.edu/u/provos/ssh/privsep.html\n\n _________________________________________________________________\n\n The CERT Coordination Center thanks Rapid7 for researching and\n reporting these vulnerabilities. \n _________________________________________________________________\n\n Author: Art Manion. \n ______________________________________________________________________\n\n This document is available from:\n http://www.cert.org/advisories/CA-2002-36.html\n ______________________________________________________________________\n\n\nCERT/CC Contact Information\n\n Email: cert@cert.org\n Phone: +1 412-268-7090 (24-hour hotline)\n Fax: +1 412-268-6989\n Postal address:\n CERT Coordination Center\n Software Engineering Institute\n Carnegie Mellon University\n Pittsburgh PA 15213-3890\n U.S.A. \n\n CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) /\n EDT(GMT-4) Monday through Friday; they are on call for emergencies\n during other hours, on U.S. holidays, and on weekends. \n\nUsing encryption\n\n We strongly urge you to encrypt sensitive information sent by email. \n Our public PGP key is available from\n http://www.cert.org/CERT_PGP.key\n\n If you prefer to use DES, please call the CERT hotline for more\n information. \n\nGetting security information\n\n CERT publications and other security information are available from\n our web site\n http://www.cert.org/\n\n To subscribe to the CERT mailing list for advisories and bulletins,\n send email to majordomo@cert.org. Please include in the body of your\n message\n\n subscribe cert-advisory\n\n * \"CERT\" and \"CERT Coordination Center\" are registered in the U.S. \n Patent and Trademark Office. \n ______________________________________________________________________\n\n NO WARRANTY\n Any material furnished by Carnegie Mellon University and the Software\n Engineering Institute is furnished on an \"as is\" basis. Carnegie\n Mellon University makes no warranties of any kind, either expressed or\n implied as to any matter including, but not limited to, warranty of\n fitness for a particular purpose or merchantability, exclusivity or\n results obtained from use of the material. Carnegie Mellon University\n does not make any warranty of any kind with respect to freedom from\n patent, trademark, or copyright infringement. \n _________________________________________________________________\n\n Conditions for use, disclaimers, and sponsorship information\n\n Copyright 2002 Carnegie Mellon University. \n\n Revision History\n\n December 16, 2002: Initial release\n\n\n-----BEGIN PGP SIGNATURE-----\nVersion: PGP 6.5.8\n\niQCVAwUBPf4qimjtSoHZUTs5AQEGbAQAiJcA+QFf2mOElaPIFwEmSRC83xlKifq/\nPlmaGbUx2UnwTIi8s2ETF8KjlfQjjgO20B4ms1MMaJ/heyxklOgpeBOQ2mpa2Tnd\nyIY7sxpBuRjF1qS6yQ8/OrcsSqVxdxZWkPLAypV11WcJlMmSxxLdKi5t86EsWic3\nxazIo8XEipc=\n=Nj+0\n-----END PGP SIGNATURE-----\n",
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Loading…
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.