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Message-ID: <20020811210903.GM22399@citi.citi.umich.edu> From: provos at citi.umich.edu (Niels Provos) Subject: OpenBSD Security Advisory: Select Boundary Condition -----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-----
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