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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.172 -- Cisco Security Advisory Solaris /bin/log vulnerability 11 April 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Secure IDS (formerly Netranger) Signaling Controler 2200 (SC2200) Virtual Switch Controller (VSC3000) PGW2200 Public Switched Telephone Network Gateway Billing and Management Server (BAMS) Voice Services Provisioning Tool (VSPT) Vendor: Cisco Systems Operating System: Solaris Impact: Root Compromise Access Required: Remote Ref: AL-2001.19 ESB-2001.542 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Cisco Security Advisory: Solaris /bin/log vulnerability Revision 1.0 For Public Release 2002 April 10 16:00 (UTC+0000) - - --------------------------------------------------------------------------- Contents Summary Products Affected Details Impact Software Versions and Fixes Obtaining Fixed Software Workarounds Exploitation and Public Announcements Status of This Notice Distribution Revision History Cisco Security Procedures - - --------------------------------------------------------------------------- Summary ======= This advisory describes a vulnerability that affects Cisco products and applications that are installed on the Solaris operating system, and is based on the vulnerabilty of an common service within the Solaris operating system, not due to a defect of the Cisco product or application. A vulnerability in the "/bin/login" program was discovered that enables an attacker to execute arbitrary code under Solaris OS. This vulnerability was discovered and publicly announced by Internet Security Systems Inc. All Cisco products and applications that are installed on Solaris OS are considered vulnerable to the underlying operating system vulnerability, unless steps have been taken to disable access services such as "bin/login". We are investigating other Solaris based products. This vulnerability can be mitigated in many cases (not all), by limiting interactive logins to trusted hosts using access control list (ACL) or other mechanisms such as firewalls. This advisory is available at the http://www.cisco.com/warp/public/707/Solaris-bin-login.shtml Products Affected ================= All products and all releases that are running on top of Solaris OS are vulnerable because the vulnerability is within Solaris and not within the other applications. Product not affected: * PGW2200 release 9.2(2) running on Solaris 2.8 is not affected. The installation CD set contains the package CSCOh015, version 2.0.1, that includes the patch for this issue. The following products are affected: Media Gateway Controller (MGC) and Related Products - - --------------------------------------------------- + Products running on Solaris 2.5.1 are vulnerable unless CSCOh008.pkg release 1.0(8) has been installed. The product that is based on this version of Solaris is Signaling Controler 2200 (SC2200). + Products running on Solaris 2.6 are vulnerable unless CSCOh007.pkg release 1.0(7) has been installed. The products that are based on this version of Solaris are: o SC2200 o Cisco Virtual Switch Controller (VSC3000) o Cisco PGW2200 Public Switched Telephone Network (PSTN) Gateway o Cisco Billing and Management Server (BAMS) o Cisco Voice Services Provisioning Tool (VSPT) Cisco IDS product - - ----------------- All releases of the Cisco Secure Intrusion Detection System (IDS, formerly Netranger) up to, but excluding, 3.0(5)Sx where "5" is the Service Pack and not the Signature Update field. Other Cisco software applications may run on Solaris platforms and where those products have not specifically been identified, customers should install security patches regularly in accordance with their normal maintenance procedures. We are investigating other Solaris based products. Details ======= All implementations of the "login" program (also known as "/bin/login" due to its location on the file system) derived from the SysV implementation are vulnerable to a buffer overflow. This vulnerability can be exploited to gain unauthorized access to a computer system without possessing legitimate credentials. The only prerequisite for exploiting this vulnerability is to have telnet or other remote login access to the computer. This vulnerability can be exploited locally and remotely. Impact ====== By gaining unauthorized access an attacker can view and modify any part of the operating system possibly leading to a breach of confidentiality and integrity of the system. Software Versions and Fixes =========================== MGC and Related Products - - ------------------------ + For the SC2200 the package CSCOh008.pkg release 1.0(8) contains the fix. The installation instruction is included within the package. + For the products based on Solaris 2.6 the package CSCOh007.pkg release 1.0(7), or higher, contains the fix. The installation instruction is included within the package. This is applicable to the following products: o SC2200 o Cisco Virtual Switch Controller (VSC3000) o Cisco PGW2200 Public Switched Telephone Network (PSTN) Gateway o Cisco Billing and Management Server (BAMS) o Cisco Voice Services Provisioning Tool (VSPT) Both packages are available at http://www.cisco.com/cgi-bin/tablebuild.pl/mgc-sol To follow the link below, you must be a registered user and you must be logged in. For all MGC and related products you may also consult the "Cisco Security Advisory: Hardening of Solaris OS for MGC" located at http://www.cisco.com/warp/public/707/Solaris-for-MGC-pub.shtml Cisco IDS product - - ----------------- For the IDS, the release 3.0(5) is the first fixed release. The fixed software can be downloaded from http://www.cisco.com/cgi-bin/tablebuild.pl/ids-appsens In order to use that link, you must be a registered user and you must be logged in. Obtaining Fixed Software ======================== Cisco is offering free software upgrades to eliminate this vulnerability for all affected customers. Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's Worldwide Web site at http://www.cisco.com. Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with the upgrade, which should be free of charge. Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows: * +1 800 553 2447 (toll-free from within North America) * +1 408 526 7209 (toll call from anywhere in the world) * e-mail: tac@cisco.com Please have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC. Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades. Workarounds =========== There is no workaround for MGC and related products. For the IDS, it is possible to mitigate the exposure by limiting hosts that can Telnet to the IDS. This procedure is described at: http://www.cisco.com /univercd/cc/td/doc/product/iaabu/csids/csids6/12216_02.htm#xtocid1115811 In short, the user must login to the IDS machine as root, type sysconfig-sensor at the prompt, select option 5 and enter the hosts allowed to telnet to the sensor. Exploitation and Public Announcements ===================================== This vulnerability has been discovered by ISS Inc. and has been disclosed publicly. The advisories are published at: * http://www.iss.net/security_center/alerts/advise105.php, and * http://www.cert.org/advisories/CA-2001-34.html Status of This Notice: INTERIM ============================== This is an interim security advisory. Cisco anticipates issuing updated versions of this notice at irregular intervals as there are material changes in the facts, and will continue to update this notice as necessary. The reader is warned that this notice may contain inaccurate or incomplete information. Although Cisco cannot guarantee the accuracy of all statements in this notice, all of the facts have been checked to the best of our ability. Cisco anticipates issuing monthly updates of this notice until it reaches FINAL status. A standalone copy or paraphrase of the text of this security advisory that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors. Distribution ============ This notice will be posted on Cisco's Worldwide Web site at http:// www.cisco.com/warp/public/707/Solaris-bin-login.shtml. In addition to Worldwide Web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients: * cust-security-announce@cisco.com * bugtraq@securityfocus.com * first-teams@first.org (includes CERT/CC) * cisco@spot.colorado.edu * comp.dcom.sys.cisco * firewalls@lists.gnac.com * Various internal Cisco mailing lists Future updates of this notice, if any, will be placed on Cisco's Worldwide Web server, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the URL given above for any updates. Revision History ================ +----------------------------------------------------------------+ |Revision 1.0|2001-April-10 16:00 UTC+0000|Initial public release| +----------------------------------------------------------------+ Cisco Security Procedures ========================= Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's Worldwide Web site at http://www.cisco.com/warp/public/707/sec_incident_response.shtml This includes instructions for press inquiries regarding Cisco security notices. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt - - --------------------------------------------------------------------------- This notice is Copyright 2002 by Cisco Systems, Inc. This notice may be redistributed freely after the release date given at the top of the text, provided that redistributed copies are complete and unmodified, and include all date and version information. - - --------------------------------------------------------------------------- - -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.3 iQEVAwUBPLQixA/VLJ+budTTAQFNwgf+M3A8IOOPAKQ5fyr5/wJKIV3PZTG7gHno fBALRteeSObWv0MIbUp3/JLDL6eAp0prqJAoFWEC2d2dxxkw1ybtRU6rzFEXPcFs F4L8EdwijDLPJPaN1rM/pK9F/Vq/bTFfrQQt6IZ/W4XNmQABnM7h7k1cdzQKnjPH WAAnbXdLGMIYAmOQ89QPM9icCMyEJzKaaPPc07/bsSoOd2tIzMH6XYgxIYgtz9V+ LJpfW5DhLal9kbELZnikGkYDaeFvTcHyFcgxvJ+vXPd8rPKPA/i6nqSRLoIGqNO8 JE63K0f7uTZUfdNTWVgedbVjg+MJxNW3ulXfwmj2O4yJEXtv5h9XpA== =8fDL - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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