Download e-book for kindle: Kernel Level Vulnerabilities. Behind the Scenes of the 5th by Last Stage of Delirium Research Group

Download e-book for kindle: Kernel Level Vulnerabilities. Behind the Scenes of the 5th by Last Stage of Delirium Research Group

By Last Stage of Delirium Research Group

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Extra resources for Kernel Level Vulnerabilities. Behind the Scenes of the 5th Argus Hacking Challenge

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Ecx) $0x20 */ */ */ */ */ */ if(getksym("upointer",(unsigned int*)&asmcode[23],&adr)==-1) exit(-1); 31 The assembly routine prepared for SCO Unixware operating system modifies saved user identifier of the current process (cr suid). The final setting of effective root privileges is achieved by invoking the setreuid(-1,0) system call. During this single system call, a new copy of credential structure is also created. 1, as no others were available). The code uses method similar to Solaris sysi86() for installing call gate descriptor and it executes code on 0 processor protection level.

U lwpp) and then the actual pointer to credentials (l cred). h include file, where additionally, an upointer is declared, which points to address of user t structure in every process. h */ typedef struct user{ ... struct lwp *u_lwpp; ... }user_t; /* pointer to LWP structure */ extern user_t *upointer; #define u (*upointer) /* current user structure */ The upointer variable is visible as an exported global kernel symbol. Its address can be obtained even in user mode by executing the getksym() system call (see [5]).

Because, alike in Solaris and SCO Unixware systems, the user data selector USER DS=0x1f covers whole 4GB of virtual memory, instructions modifying process’ credentials can access kernel memory through %ds selector. Return to user mode can be made with the use of lret instruction, but this time without any additional parameters, as no call gate parameters has been copied on the kernel stack. Because SCO OpenServer stores user and group process identifiers in the user area instead of the shared cred structure (like in the case of Solaris and SCO Unixware), there is no risk of causing inconsistency of kernel data.

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