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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.410 -- OpenBSD Security Advisory Select Boundary Condition 12 August 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenBSD Vendor: OpenBSD Operating System: OpenBSD Impact: Root Compromise Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- OpenBSD Security Advisory (adv.select) Original Release Date: 2002-08-11 1. Systems affected: All versions of OpenBSD. 2. Overview: Insufficient boundary checks in the select call allow an attacker to overwrite kernel memory and execute arbitrary code in kernel context. Traditionally, the size parameter for the select system call is a signed integer. As a result, the kernel evaluates the upper boundary checks in a signed context, so that an attacker can circumvent when using certain negative values. When the kernel copies the data for the select system call from userland the size is used as an unsigned integer which causes kernel memory to be overwritten with arbitrary data. 2. Impact: Local users can obtain complete system privileges and circumvent the extra security measures provided by the securelevel system. 3. Solution: Apply one of the supplied kernel patches or update to 3.0-stable or 3.1-stable from 2002-08-11 17:00 EDT or later. 4. Patch: ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/014_scarg.patch - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (OpenBSD) iQEVAwUBPVbSKDZ8FqYKL4flAQGGTAgAoRmp24ZjsC3opJvaHe5I2T3smBIxwfCQ jfuQQmxKstnOf9mgvEunkdoMDuuksNlWX13skLoTm0c0mvjFTp2ctRdUH/o0rHdj Ya8nFmkTaG98hOv73AcKN+7xG1j6I0v6tvifZqOoIUGTed76CYfSIH7Xtblmy0fl 1vgMsuKVXUQu+Db3+zBw1XY6ke6YtK1cgVaJjbfjdpiS9yOHCun4fvGvIkWdqGmH QFT928uzAKLnz1kieynTGLVMOHgt064mV6MjDrYpqu4hUo9UVREaVOrHb6aEOpi+ VeicbnT+OWn7EdGsKiS14YajXj/UuE5bdz2gCV/QU4zGiwnLXfBfMQ== =MHDm - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. 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: firstname.lastname@example.org 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: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPVfl+Sh9+71yA2DNAQEASQP/bwJXoDwAXJ2qk1002B9BqyQOfspTc94D IZLg1kHpqcnyA5HCEWH7DqLvJ8gWlzo71sKfmhiNehPsm+K/aY8ZJvjBh3M4CHyH jJRJfIoAiYYu0CBH3ZlrIMUzpgpFSpE33DBhMN++sr5lelJRZJZ8QcSjqc5GkFdB u6bl7QsVh3Y= =dZCw -----END PGP SIGNATURE-----