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IE的0day满天飞,不过IE的粉丝还是不少地( Y+ @" W2 X1 ]4 |# F) m; F) L' m
( v' y7 s4 n x+ R在舒服地浏览网页的同时,不要忘了合理地规避风险
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由于 很多IE的漏洞都会向system32目录下写入文件,都会去终止防火墙,AV。。而所有这些都需要有Administrator权限 ^+ a, H2 @4 V. R, S" s* b
基于这点,Michael Howard写了一个降低IE权限的小工具 DropMyRights& ]! W* j6 P' E C2 i# {4 m
2 x) p+ H6 ~) i4 _% h! t原理就是删除用户当前token的一些权限和SID,用处理过的token,去创建新进程,IE,OE,Firefox,FOXMAIL。。。. s; t2 V8 W4 t/ L% q& U9 m
- m: H; s1 r5 P- F9 i安装过程: W7 x ]% O& d4 K) Z& T1 N
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1.下载 DropMyRights.msi
% m+ m+ f6 X5 L5 l' l_blank>http://download.microsoft.com/download/f/2/e/f2e49491-efde-4bca-9057-adc89c476ed4/DropMyRights.msi! }* _' m$ f/ d
4 \; e# t; {& U2.安装之后,把DropMyRights.exe copy到一个"安全的"目录 (设置好acl,不然又会有新的隐患 ) [, R$ [+ l9 g) `+ ~
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3.创建一个快捷方式,路经的格式类似下面这样:
/ ^* H9 c$ B3 K2 y _C:\safeDIR\dropmyrights.exe "c:\program files\internet explorer\iexplore.exe". [+ u% N# w! p- U
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4.快捷方式的名字默认是dropmyrights.exe ,最好改一下,搞个IE safe ,IE (non-admin)之类的,以示区别: a# @7 U; a) @ F3 }- [
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5.在属性里改个看着舒服点的图标,最好就用IE的
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\) {% ^" K6 ]+ m3 `ok了,以后你上网的时候就打开这个快捷方式,去调用ie,不要直接去点原来的IE% D- u8 k" W Y( K6 g L
" X2 U8 d2 r2 U( D* i- b4 B; `/ V不过还有个小问题,一些地方直接调用ie(如MSN)去打开网页的话还是会直接调用原来的iexplore.exe
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$ w- r6 }3 u+ h4 c! J9 L4 ?# c//当然这个工具实现起来也很简单,下面坐着提供的核心代码
: e" I1 a+ b% t5 H5 d//////////////////////////////////////////////////////////////////////////////////+ `9 k: L+ u+ ~; V' I. V
DWORD wmain(int argc, wchar_t **argv) {
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DWORD fStatus = ERROR_SUCCESS;9 L& L0 U' |" F8 a% E! e2 d+ g8 b
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if (2 != argc && 3 != argc) {
% N9 }9 n! Y! p4 L8 k2 \# W9 V% } Usage();) g+ @* h% h. L4 D! p9 U# [/ ]
return ERROR_INVALID_PARAMETER;3 U4 |5 o3 N# r! n( p
}& i% t- i1 r4 n4 R
: n6 _6 R7 S! y9 q2 i // get the SAFER level. `& ]1 X1 J9 S+ o- T. [' ^2 L
DWORD hSaferLevel = SAFER_LEVELID_NORMALUSER;' `+ R: |) g0 C
if (3 == argc && argv[2]) {: i# m: j2 Z9 w$ K; q" I
switch(argv[2][0]) {; ` ?9 g" V3 F' q
case 'C' : & S* q" M6 g' C' B
case 'c' : hSaferLevel = SAFER_LEVELID_CONSTRAINED;
$ c `8 T7 A7 Z( s1 R break;
8 K- h w( M& p( O case 'U' :- B8 F8 ^. `9 Y+ _
case 'u' : hSaferLevel = SAFER_LEVELID_UNTRUSTED;+ O1 F n: q8 s+ a: k5 S \; I& Q
break;* E( F$ f4 l6 D( H
6 y# a: G7 K% l; n default : hSaferLevel = SAFER_LEVELID_NORMALUSER;& n0 \; k3 R) h/ X/ v1 s% f$ y
break;( A6 _ V& `6 `" ^! e5 K% Y
}! T9 g" a# V' S- w- l- @7 h
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// get the command line, and make sure it's not bogus6 K2 d j# y( y
wchar_t *wszPath = argv[1];
8 u1 `" \' G( J size_t cchLen = 0;
, r" B( Y% w5 y1 ~, j! g if (FAILED(StringCchLength(wszPath,MAX_PATH,&cchLen)))
* P6 N5 D$ V6 ^8 i7 b return ERROR_INVALID_PARAMETER;
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SAFER_LEVEL_HANDLE hAuthzLevel = NULL;
" C% o0 y5 U- j% j8 M if (SaferCreateLevel(SAFER_SCOPEID_USER,0 D+ s$ r9 U- s) B
hSaferLevel, ~1 R4 k/ h2 y* ~ n" P
0,
8 T2 N( i* V2 {+ i &hAuthzLevel, NULL)) {
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// Generate the restricted token we will use.: ~% z/ E9 \& V/ g5 D; w
HANDLE hToken = NULL;) e6 ]' |; e! ]4 T+ ~
if (SaferComputeTokenFromLevel(" H" ?' [) c- C( N8 @ Y
hAuthzLevel, // SAFER Level handle
) C5 ]+ S- v- g9 k1 i8 h NULL, // NULL is current thread token.) f# ^2 e# L1 T8 [! R* a
&hToken, // Target token
1 z3 v3 H* ?5 O7 T8 W/ H 0, // No flags
0 g( l$ V: Z7 H NULL)) { // Reserved0 A0 J% h k, W% t4 d
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STARTUPINFO si;/ l$ C, Q$ ?9 A% ^
ZeroMemory(&si, sizeof(STARTUPINFO));
" w, L2 [0 P: E4 X, t' M si.cb = sizeof(STARTUPINFO);
4 b" [- u$ c6 x6 j' c) u si.lpDesktop = NULL;7 U. f$ M" U$ p i4 E3 a
+ E0 M" Q+ X: P // Spin up the new process8 e$ u4 x& q5 C. x8 k
PROCESS_INFORMATION pi;, N8 F E6 s6 T+ p) Y
if (CreateProcessAsUser(
# h" n# x3 I% t+ R0 e& T1 a hToken,. e: j; O* L6 x& C( C# F; [1 l
wszPath, NULL,
7 m. N/ R4 W! f _ NULL, NULL,, E7 b% J# ?3 x' v3 B- c" k: K
FALSE, CREATE_NEW_CONSOLE,
8 D& b/ r( r" J" K NULL, NULL,
8 z5 e, i9 l, B: D K7 _ &si, &pi)) {) ?" D* g. y2 T5 ]. T. G1 o7 i
) ?, h Q8 I" A, ?" D# q- r! B3 R CloseHandle(pi.hProcess);) j& r3 h# D# J8 ?. y
CloseHandle(pi.hThread);
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} else {
/ Y" w7 F! E+ e+ M$ }2 m! q, W1 @# u fStatus = GetLastError();: M/ J! p, ^# ^
fwprintf(stderr,L"CreateProcessAsUser failed (%lu)\n",fStatus);' @8 F- d+ G5 r Q% G$ R* j" m( {
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} else {) s9 O3 @- L" B6 a( z
fStatus = GetLastError();
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, P+ N$ h& H: Q% J SaferCloseLevel(hAuthzLevel);2 K- P) h& Y3 v+ _
4 Q# |( ?1 m* @: V/ a; \! i4 O } else {
; {' y! {$ ^5 Z; p- A fStatus = GetLastError();
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return fStatus;
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% L# E: b' _; z7 U* ]更详细的细节大家可以参考MSDN上坐着的原文
% M$ T+ H% _% ^1 }1 O, o<<Browsing the Web and Reading E-mail Safely as an Administrator>>
7 p+ K' K% g! x
+ _- ~" e) p6 t4 LMichael Howard
* X+ }2 L& J- I+ P5 q1 F' K, f" VMicrosoft Security Engineering
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November 15, 2004$ M _- X% ~1 ?2 `7 k' Z1 w
, k$ m& d2 D: b" o {% }& g6 g_blank>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncode/html/secure11152004.asp - _+ e9 D) d$ ~, r) c
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ps:"c:\program files\internet explorer\iexplore.exe"% }) k& U6 c! o: \3 a `
记得在快捷方式里iexplore.exe的路径加上引号3 J- B; V1 k" t5 f- [. J
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