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Linux Kernel "splice()" O_APPEND Bypass and I915 Privilege Escalation
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Secunia Advisory:
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SA32320
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Release Date:
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2008-10-20
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Last Update:
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2008-10-23
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Popularity:
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2,750 views
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Critical:
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Less critical
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Impact:
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Security Bypass
Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| OS: | Linux Kernel 2.6.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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Description:
A weakness and a vulnerability have been reported in the Linux kernel, which can be exploited by malicious, local users to bypass certain security restrictions and potentially gain escalated privileges.
1) A vulnerability is caused due to the DRM_I915_HWS_ADDR IOCTL being available to non-root users, which can be exploited to e.g. zero and remap memory locations by sending a specially crafted IOCTL to the driver.
Successful exploitation may allow to execute arbitrary code with escalated privileges, but requires an Intel G33 series or newer chipset.
2) A weakness is caused due to the "do_splice_from()" function in fs/splice.c not honoring the "O_APPEND" flag. This can be exploited by using the "splice()" system call to write to arbitrary locations in a file regardless of the "O_APPEND" setting.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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