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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0253 -- HEWLETT-PACKARD COMPANY SECURITY BULLETIN: HPSBUX0304-253 SSRT3531 Potential Security Vulnerability in sendmail (rev.1) 07 April 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: sendmail Vendor: Hewlett-Packard Operating System: HP-UX 11.22 HP-UX 11.11 HP-UX 11.04(VVOS) HP-UX 11.00 HP-UX 10.20 HP-UX 10.10 Platform: HP 9000 Series 700/800 Impact: Root Compromise Denial of Service Access Required: Remote CVE Names: CAN-2003-0161 Ref: AL-2003.05 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ----------------------------------------------------------------- **REVISED 01** Source: HEWLETT-PACKARD COMPANY SECURITY BULLETIN: HPSBUX0304-253 Originally issued: 03 April 2003 Last revised: 04 April 2003 SSRT3531 Potential Security Vulnerability in sendmail (rev.1) ----------------------------------------------------------------- NOTICE: There are no restrictions for distribution of this Bulletin provided that it remains complete and intact. The information in the following Security Bulletin should be acted upon as soon as possible. Hewlett-Packard Company will not be liable for any consequences to any customer resulting from customer's failure to fully implement instructions in this Security Bulletin as soon as possible. ----------------------------------------------------------------- PROBLEM: Potential security vulnerability in sendmail IMPACT: Potential unauthorized Privileged Access, Potential Denial of Service (DoS). PLATFORM: HP 9000 Series 700/800 Servers running HP-UX 10.10, 10.20, 11.00, 11.04(VVOS), 11.11, and 11.22. SOLUTION: Download and install the appropriate files or the --> HPSecurityBul253.depot. --> The sendmail files and HPSecurityBul253.depot --> referenced in HPSBUX0304-253 also address the --> issues documented in HPSBUX0302-246. --> If the sendmail files or HPSecurityBul253.depot --> from HPSBUX0304-253 are installed, it is not necessary --> to install the sendmail files or HPSecurityBul246.depot --> from HPSBUX0302-246. --> If both sets of sendmail files, or both depots, are --> installed, the sendmail files or HPSecurityBul253.depot --> from HPSBUX0304-253 must be installed *AFTER* the --> sendmail files or HPSecurityBul246.depot from HP --> HPSBUX0302-246 in order to ensure all issues are --> addressed. MANUAL ACTIONS: Yes - NonUpdate Download and install the appropriate sendmail file. **REVISED 01** AVAILABILITY: Fixes are available for 10.20, 11.00, 11.04(VVOS), --> 11.11, and 11.22. This bulletin will be revised --> when a fix is available for 10.10. CHANGE SUMMARY: Rev.01 - Added fix for 11.22. Added HPSecurityBul253.depot. ----------------------------------------------------------------- A. Background A potential security vulnerability with sendmail has been reported in HP-UX. This potential vulnerability may result in unauthorized Privileged Access or a Denial of Service (DoS). This potential vulnerability may be exploited remotely. This is the vulnerability reported in CERT/CC CA-2003-12. Note: In order to provide fixes as soon as possible manually installed files are being provided initially. A depot and patches containing these files will be provided as soon as they can be created. **REVISED 01** --> A depot (HPSecurityBul253.depot) is now available. Note: This problem also affects: HP Tru64 UNIX/TruCluster Server V4.x and V5.x HP Tru64 UNIX Engineering continues to work this issue at the highest priority. As solution information becomes available HP will provide notice of the availability of any necessary patches through standard security bulletin announcements and be available from your normal HP Services support channel. The HP Tru64 bulletin will be posted to the customer support website within 24 hours of release to - http://thenew.hp.com/country/us/eng/support.html or www.hp.com Use the SEARCH IN feature box, enter SSRT in the search window or use a specific SSRT # (example: SSRT3531) HP ProLiant Servers If running Open Source Sendmail, refer to the following Sendmail Consortium URL for patch details or upgrades: http://www.sendmail.org As more information becomes available HP will provide notice of the availability of any necessary patches through standard security bulletin announcements and be available from your normal HP Services support channel. NOT VULNERABLE: HP NonStop Servers HP OpenVMS. B. Recommended solution Note: The fixes mentioned here include the fix for for HPSBUX0302-246. The files are named to be consistent with the names used in HPSBUX0302-246. For example, HPSBUX0302-246 provided sendmail.811.11.11.r1. This bulletin provides sendmail.811.11.11.r2. All versions of sendmail provided by HP on HP-UX 10.X and 11.X are vulnerable unless one of the fixes described below has been installed. Note: All the files mentioned for download below are available from the following ftp site: System: hprc.external.hp.com (192.170.19.51) Login: sendmail Password: sendmail FTP Access: ftp://sendmail:sendmail@hprc.external.hp.com/ or: ftp://sendmail:sendmail@192.170.19.51/ or: ftp hprc.external.hp.com Note: There is an ftp defect in IE5 that may result in a browser hang. To work around this: - Select Tools -> Internet Options -> Advanced - Un-check the option: [ ] Enable folder view for FTP sites ================================================== To fix the problem: 1. Determine the sendmail version. 2. If necessary upgrade to a version of sendmail for which a fix is available. Existing 8.11.1 versions MUST be updated to the versions listed below or subsequent. 3. Modify sendmail.cf. **REVISED 01** --> EITHER -->4. Download and install HPSecurityBul253.depot.gz. --> OR -->5. Download and install the appropriate sendmail and killsm files. Details: 1. Determine the sendmail version. Login in as root: cd /usr/sbin sendmail -d0.1 < /dev/null | grep -i version The display will show Version #.#.# 2. If necessary upgrade to a version of sendmail for which a fix is available. Fixes are available for the following versions: HP-UX 10.20: sendmail 8.9.3 HP-UX 11.00: sendmail 8.11.1 HP-UX 11.00: sendmail 8.9.3 VVOS 11.04: sendmail 8.9.3 HP-UX 11.11: sendmail 8.11.1 HP-UX 11.11: sendmail 8.9.3 --> HP-UX 11.22: sendmail 8.11.1 --> Note: Existing sendmail 8.11.1 on 11.00 and 11.11 --> MUST be updated to the versions listed below. If you are not running one the those versions, you will need to upgrade as follows: HP-UX 10.20 Upgrade to 8.9.3 by installing PHNE_25183. HP-UX 11.00 Upgrade to 8.9.3 by by installing PHNE_24419. OR Upgrade to 8.11.1 by installing the web upgrade available on http://www.software.hp.com Sendmail 8.11.1 Version 2 (B.11.00.01.002) released in March 2003 VVOS 11.04 (Virtual Vault Operating System): Upgrade to 8.9.3 by installing PHNE_25984. Note: VVOS does not support the web upgrade version of sendmail 8.11.1. HP-UX 11.11 Upgrade to 8.11.1 by installing the web upgrade available on http://www.software.hp.com Sendmail 8.11.1 Version 3 (B.11.11.01.003) released in March 2003 3. Modify sendmail.cf Add "restrictqrun" to the PrivacyOptions. After the change the line should read: O PrivacyOptions=authwarnings,restrictqrun This change has already been made in the /usr/newconfig/mail/sendmail.cf file delivered with the new 8.11.1. For 8.9.3 the change must be made in the /usr/newconfig/mail/sendmail.cf file. For both 8.9.3 and 8.11.1 the change must be made in the /etc/mail/sendmail.cf file. -->Note: Perform either step 4 or step 5. -->4. Download and install HPSecurityBul253.depot.gz: --> a. Download HPSecurityBul253.depot.gz --> b. Unpack the file with gunzip(1) --> c. Verify the cksum or the md5 sum. --> cksum HPSecurityBul253.depot --> 3387599586 6860800 HPSecurityBul253.depot --> md5 HPSecurityBul253.depot --> MD5 (HPSecurityBul253.depot) = --> d5019256abfa93e034eeccc319df11ef --> d. Extract the "readme" file for further information: --> cd directory_containing_depot --> swlist -d -l product -a readme --> @ $PWD/HPSecurityBul253.depot --> e. Install HPSecurityBul253.depot with swinstall(1). 5. Download and install the appropriate file. a. Download the appropriate file(s). For HP-UX 10.20: sendmail.893.10.20.r1.gz for 8.9.3 killsm.893.10.20 for 8.9.3 For HP-UX 11.00: sendmail.811.11.00.r1.gz for 8.11.1 sendmail.893.11.00.r1.gz for 8.9.3 killsm.893.11.00 for 8.9.3 For HP-UX 11.04: sendmail.893.11.00.r1.gz for 8.9.3 killsm.893.11.00 for 8.9.3 For HP-UX 11.11: sendmail.811.11.11.r2.gz for 8.11.1 sendmail.893.11.11.r1.gz for 8.9.3 killsm.893.11.11 for 8.9.3 **REVISED 01** --> For HP-UX 11.22: sendmail.811.11.22.r1.gz for 8.11.1 --> killsm.811.11.22 for 8.11.1 --> Note: Because of changes to sendmail a new version of --> killsm is required. The new version is included --> in the latest web upgrade for 8.11.1 on 11.00 amd --> 11.11. Since there is no web upgrade for 8.11.1 --> on 11.22, the killsm.811.11.22 is needed. b. Unpack the file with gunzip(1) c. Verify the cksum or the md5 sum. cksum: 2336630777 811008 sendmail.893.10.20.r1 3989146179 1042 killsm.893.10.20 342459522 831488 sendmail.893.11.00.r1 2688504642 1052 killsm.893.11.00 3227626308 970752 sendmail.811.11.00.r1 3541980035 864256 sendmail.893.11.11.r1 651707972 1053 killsm.893.11.11 3137083796 1015808 sendmail.811.11.11.r2 --> 23403750 2312460 sendmail.811.11.22.r1 --> 3188566214 1191 killsm.811.11.22 Note: If you wish to verify the md5 sum and you do not have a copy of md5, please refer to: HPSBUX9408-016 Patch sums and the MD5 program Note: Using your itrc account security bulletins can be found here: http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin MD5 (sendmail.893.10.20.r1) = 6fdfd434b5a1c90907dc1149f8e7e5b2 MD5 (killsm.893.10.20) = 8aebbdb41ee527d8bae398a5feda82dd MD5 (sendmail.893.11.00.r1) = ae011668557a64d93d5b683380332b8d MD5 (killsm.893.11.00) = 4eb6f978de78540790487931b8f43eb1 MD5 (sendmail.811.11.00.r1) = 99b9c6f895fef1b923500df158f01678 MD5 (sendmail.893.11.11.r1) = 3be01a159408fa1090d1f7aafe822c88 MD5 (killsm.893.11.11) = a2c24f912bcf84ffb9dbb92620cac020 MD5 (sendmail.811.11.11.r2) = afe970b69d99a73faf7808917115f11f -->MD5 (sendmail.811.11.22.r1) = dbae99173b44bc5b9698a009456345af -->MD5 (killsm.811.11.22) = 3f456a09a76692fb0e77fe2cdb38e5f7 d. Install the appropriate file as follows: Copy the appropriate sendmail file to a protected directory such as /usr/sbin. If you are running sendmail 8.9.3 also copy the appropriate killsm file to a protected directory such as /usr/sbin. Login as root and run killsm: killsm Verify the sendmail daemon is not running: ps -ef | grep sendmail If you are running the 8.9.3 version of sendmail replace killsm as follows: cd /usr/sbin cp killsm killsm.orig cp killrm.893.10.20 killsm OR cp killrm.893.11.00 killsm OR cp killrm.893.11.11 killsm **REVISED 01** --> If you are runnimg 11.22: --> cd /usr/sbin --> cp killsm killsm.orig --> cp killrm.811.11.22 killsm For all versions of sendmail, make a backup copy of the existing sendmail: cd /usr/sbin cp sendmail sendmail.original Note the permissions for reference: ls -lia /usr/sbin/sendmail Install the new sendmail: cp sendmail.xxx.yy.zz.rn sendmail For example, on 11.11: cp sendmail.811.11.11.r2 sendmail Restart sendmail. If you were running sendmail before the killsm command above, you can now restart it with the following command (for HP-UX, not VVOS): /sbin/init.d/sendmail start Note: Do not execute the command above for VVOS 11.04 The command runs sendmail as a daemon, which is not supported by VVOS (Virtual Vault Operating System). --> End of Step 5. ================================================== Note: If you receive either of the following messages after applying the fix, please follow the recommended action. warning: /etc/mail/aliases has world read or write permission. This is unsafe. warning: /etc/mail/aliases.db has world read or write permission. This is unsafe. Recommended action Execute the following commands. chmod 640 /etc/mail/aliases chmod 640 /etc/mail/aliases.db sendmail -bi C. To subscribe to automatically receive future NEW HP Security Bulletins from the HP IT Resource Center via electronic mail, do the following: Use your browser to get to the HP IT Resource Center page at: http://itrc.hp.com Use the 'Login' tab at the left side of the screen to login using your ID and password. Use your existing login or the "Register" button at the left to create a login, in order to gain access to many areas of the ITRC. Remember to save the User ID assigned to you, and your password. In the left most frame select "Maintenance and Support". Under the "Notifications" section (near the bottom of the page), select "Support Information Digests". To -subscribe- to future HP Security Bulletins or other Technical Digests, click the check box (in the left column) for the appropriate digest and then click the "Update Subscriptions" button at the bottom of the page. or To -review- bulletins already released, select the link (in the middle column) for the appropriate digest. NOTE: Using your itrc account security bulletins can be found here: http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin To -gain access- to the Security Patch Matrix, select the link for "The Security Bulletins Archive". (near the bottom of the page) Once in the archive the third link is to the current Security Patch Matrix. Updated daily, this matrix categorizes security patches by platform/OS release, and by bulletin topic. Security Patch Check completely automates the process of reviewing the patch matrix for 11.XX systems. For information on the Security Patch Check tool, see: http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/ displayProductInfo.pl?productNumber=B6834AA The security patch matrix is also available via anonymous ftp: ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/ On the "Support Information Digest Main" page: click on the "HP Security Bulletin Archive". The PGP key used to sign this bulletin is available from several PGP Public Key servers. The key identification information is: 2D2A7D59 HP Security Response Team (Security Bulletin signing only) <security-alert@hp.com> Fingerprint = 6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59 If you have problems locating the key please write to security-alert@hp.com. Please note that this key is for signing bulletins only and is not the key returned by sending 'get key' to security-alert@hp.com. D. To report new security vulnerabilities, send email to security-alert@hp.com Please encrypt any exploit information using the security-alert PGP key, available from your local key server, or by sending a message with a -subject- (not body) of 'get key' (no quotes) to security-alert@hp.com. ----------------------------------------------------------------- (c)Copyright 2003 Hewlett-Packard Company Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of HP products referenced herein are trademarks and/or service marks of Hewlett-Packard Company. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 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). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPpFiFih9+71yA2DNAQHZAQQAnEQZSaRY+vhpJo3bCuJhwDxw6PyhnMNQ 6sEgBbZ71QAjf3WqHj1L4XiBF4ZcZ7mfCCrax4TS01Moy8DCbxRv5IEF8kpDlQhU Xq1FYaiYpG3beA2bIfWe1epgySau9NKVjstpSLTbW4Eai78PtD+ySJ2khNH3rOwc 3FaLZLY6Q1U= =x+j6 -----END PGP SIGNATURE-----