SecurityFocus

Multiple OS kernel insecure handling of stdio file descriptor Jan 18 2007 02:21PM
XFOCUS Security Team (security xfocus org) (3 replies)

Re: Multiple OS kernel insecure handling of stdio file descriptor Jan 19 2007 11:19PM
Shiva Persaud (shivapd austin ibm com) (1 replies)

Re: Multiple OS kernel insecure handling of stdio file descriptor Jan 20 2007 05:43PM
eugeny gladkih (john drweb com)

Re: Multiple OS kernel insecure handling of stdio file descriptor Jan 18 2007 09:04PM
Peter Jeremy (peter jeremy alcatel-lucent com au) (1 replies)

On 2007-Jan-18 22:21:52 +0800, XFOCUS Security Team <security (at) xfocus (dot) org [email concealed]> wrote:
>The affected OSes allows local users to write to or read from restricted
>files by closing the file descriptors 0 (standard input), 1 (standard
>output), or 2 (standard error), which may then be reused by a called
>setuid process that intended to perform I/O on normal files. the attack
>which exploit this vulnerability possibly get root right.

This vulnerability has been known for years. OpenBSD implemented a
kernel check to block this attack in 1998. FreeBSD and NetBSD have
similar kernel checks and I believe glibc also has checks to block
this. It is disturbing that none of the commercial OS vendors appear
to have bothered to protect against this.

--
Peter Jeremy
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[ reply ]

Re: Multiple OS kernel insecure handling of stdio file descriptor Jan 20 2007 06:35PM
Carson Gaspar (carson taltos org)

Re: Multiple OS kernel insecure handling of stdio file descriptor Jan 18 2007 06:30PM
3APA3A (3APA3A SECURITY NNOV RU)