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curl.10931
curl-7.37.0-CVE-2018-1000120.patch
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File curl-7.37.0-CVE-2018-1000120.patch of Package curl.10931
From 8d68181ecaf1623f0ae80b1daa7f2d4fe25113d8 Mon Sep 17 00:00:00 2001 From: Daniel Stenberg <daniel@haxx.se> Date: Wed, 31 Jan 2018 08:40:11 +0100 Subject: [PATCH] FTP: reject path components with control codes Refuse to operate when given path components featuring byte values lower than 32. Previously, inserting a %00 sequence early in the directory part when using the 'singlecwd' ftp method could make curl write a zero byte outside of the allocated buffer. Test case 340 verifies. --- lib/ftp.c | 8 ++++---- tests/data/Makefile.inc | 3 +++ tests/data/test340 | 40 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 47 insertions(+), 4 deletions(-) create mode 100644 tests/data/test340 Index: curl-7.37.0/lib/ftp.c =================================================================== --- curl-7.37.0.orig/lib/ftp.c +++ curl-7.37.0/lib/ftp.c @@ -1488,25 +1488,22 @@ static CURLcode ftp_state_list(struct co then just do LIST (in that case: nothing to do here) */ char *cmd,*lstArg,*slashPos; + const char *inpath = data->state.path; lstArg = NULL; if((data->set.ftp_filemethod == FTPFILE_NOCWD) && - data->state.path && - data->state.path[0] && - strchr(data->state.path,'/')) { - - lstArg = strdup(data->state.path); - if(!lstArg) - return CURLE_OUT_OF_MEMORY; + inpath && inpath[0] && strchr(inpath, '/')) { + size_t n = strlen(inpath); /* Check if path does not end with /, as then we cut off the file part */ - if(lstArg[strlen(lstArg) - 1] != '/') { - + if(inpath[n - 1] != '/') { /* chop off the file part if format is dir/dir/file */ - slashPos = strrchr(lstArg,'/'); - if(slashPos) - *(slashPos+1) = '\0'; + slashPos = strrchr(inpath, '/'); + n = slashPos - inpath; } + result = Curl_urldecode(data, inpath, n, &lstArg, NULL, TRUE); + if(result) + return result; } cmd = aprintf( "%s%s%s", @@ -1517,19 +1514,16 @@ static CURLcode ftp_state_list(struct co lstArg? lstArg: "" ); if(!cmd) { - if(lstArg) - free(lstArg); + free(lstArg); return CURLE_OUT_OF_MEMORY; } result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", cmd); - if(lstArg) - free(lstArg); - + free(lstArg); free(cmd); - if(result != CURLE_OK) + if(result) return result; state(conn, FTP_LIST); @@ -3211,8 +3205,7 @@ static CURLcode ftp_done(struct connectd ssize_t nread; int ftpcode; CURLcode result = CURLE_OK; - bool was_ctl_valid = ftpc->ctl_valid; - char *path; + char *path = NULL; const char *path_to_use = data->state.path; if(!ftp) @@ -3240,10 +3233,9 @@ static CURLcode ftp_done(struct connectd /* the connection stays alive fine even though this happened */ /* fall-through */ case CURLE_OK: /* doesn't affect the control connection's status */ - if(!premature) { - ftpc->ctl_valid = was_ctl_valid; + if(!premature) break; - } + /* until we cope better with prematurely ended requests, let them * fallback as if in complete failure */ default: /* by default, an error means the control connection is @@ -3257,23 +3249,20 @@ static CURLcode ftp_done(struct connectd } /* now store a copy of the directory we are in */ - if(ftpc->prevpath) - free(ftpc->prevpath); + free(ftpc->prevpath); if(data->set.wildcardmatch) { if(data->set.chunk_end && ftpc->file) { data->set.chunk_end(data->wildcard.customptr); } ftpc->known_filesize = -1; } /* get the "raw" path */ - path = curl_easy_unescape(data, path_to_use, 0, NULL); - if(!path) { - /* out of memory, but we can limp along anyway (and should try to - * since we may already be in the out of memory cleanup path) */ - if(!result) - result = CURLE_OUT_OF_MEMORY; + result = Curl_urldecode(data, path_to_use, 0, &path, NULL, TRUE); + if(result) { + /* We can limp along anyway (and should try to since we may already be in + * the error path) */ ftpc->ctl_valid = FALSE; /* mark control connection as bad */ conn->bits.close = TRUE; /* mark for connection closure */ ftpc->prevpath = NULL; /* no path remembering */ @@ -4238,15 +4226,16 @@ CURLcode ftp_parse_url_path(struct conne the first condition in the if() right here, is there just in case someone decides to set path to NULL one day */ - if(data->state.path && - data->state.path[0] && - (data->state.path[strlen(data->state.path) - 1] != '/') ) - filename = data->state.path; /* this is a full file path */ + if(path_to_use[0] && + (path_to_use[strlen(path_to_use) - 1] != '/') ) + filename = path_to_use; /* this is a full file path */ /* + else { ftpc->file is not used anywhere other than for operations on a file. In other words, never for directory operations. So we can safely leave filename as NULL here and use it as a argument in dir/file decisions. + } */ break; @@ -4260,6 +4249,7 @@ CURLcode ftp_parse_url_path(struct conne slash_pos=strrchr(cur_pos, '/'); if(slash_pos || !*cur_pos) { size_t dirlen = slash_pos-cur_pos; + CURLcode result; ftpc->dirs = calloc(1, sizeof(ftpc->dirs[0])); if(!ftpc->dirs) @@ -4268,12 +4258,13 @@ CURLcode ftp_parse_url_path(struct conne if(!dirlen) dirlen++; - ftpc->dirs[0] = curl_easy_unescape(conn->data, slash_pos ? cur_pos : "/", - slash_pos ? curlx_uztosi(dirlen) : 1, - NULL); - if(!ftpc->dirs[0]) { + result = Curl_urldecode(conn->data, slash_pos ? cur_pos : "/", + slash_pos ? dirlen : 1, + &ftpc->dirs[0], NULL, + TRUE); + if(result) { freedirs(ftpc); - return CURLE_OUT_OF_MEMORY; + return result; } ftpc->dirdepth = 1; /* we consider it to be a single dir */ filename = slash_pos ? slash_pos+1 : cur_pos; /* rest is file name */ @@ -4291,7 +4282,7 @@ CURLcode ftp_parse_url_path(struct conne return CURLE_OUT_OF_MEMORY; /* we have a special case for listing the root dir only */ - if(strequal(path_to_use, "/")) { + if(!strcmp(path_to_use, "/")) { cur_pos++; /* make it point to the zero byte */ ftpc->dirs[0] = strdup("/"); ftpc->dirdepth++; @@ -4308,18 +4299,14 @@ CURLcode ftp_parse_url_path(struct conne /* we skip empty path components, like "x//y" since the FTP command CWD requires a parameter and a non-existent parameter a) doesn't work on many servers and b) has no effect on the others. */ - int len = curlx_sztosi(slash_pos - cur_pos + absolute_dir); - ftpc->dirs[ftpc->dirdepth] = - curl_easy_unescape(conn->data, cur_pos - absolute_dir, len, NULL); - if(!ftpc->dirs[ftpc->dirdepth]) { /* run out of memory ... */ - failf(data, "no memory"); - freedirs(ftpc); - return CURLE_OUT_OF_MEMORY; - } - if(isBadFtpString(ftpc->dirs[ftpc->dirdepth])) { - free(ftpc->dirs[ftpc->dirdepth]); + size_t len = slash_pos - cur_pos + absolute_dir; + CURLcode result = + Curl_urldecode(conn->data, cur_pos - absolute_dir, len, + &ftpc->dirs[ftpc->dirdepth], NULL, + TRUE); + if(result) { freedirs(ftpc); - return CURLE_URL_MALFORMAT; + return result; } } else { @@ -4355,15 +4342,12 @@ CURLcode ftp_parse_url_path(struct conne } /* switch */ if(filename && *filename) { - ftpc->file = curl_easy_unescape(conn->data, filename, 0, NULL); - if(NULL == ftpc->file) { - freedirs(ftpc); - failf(data, "no memory"); - return CURLE_OUT_OF_MEMORY; - } - if(isBadFtpString(ftpc->file)) { + CURLcode result = + Curl_urldecode(conn->data, filename, 0, &ftpc->file, NULL, TRUE); + + if(result) { freedirs(ftpc); - return CURLE_URL_MALFORMAT; + return result; } } else @@ -4381,11 +4365,13 @@ CURLcode ftp_parse_url_path(struct conne if(ftpc->prevpath) { /* prevpath is "raw" so we convert the input path before we compare the strings */ - int dlen; - char *path = curl_easy_unescape(conn->data, data->state.path, 0, &dlen); - if(!path) { + size_t dlen; + char *path; + CURLcode result = + Curl_urldecode(conn->data, data->state.path, 0, &path, &dlen, TRUE); + if(result) { freedirs(ftpc); - return CURLE_OUT_OF_MEMORY; + return result; } dlen -= ftpc->file?curlx_uztosi(strlen(ftpc->file)):0; Index: curl-7.37.0/tests/data/test340 =================================================================== --- /dev/null +++ curl-7.37.0/tests/data/test340 @@ -0,0 +1,40 @@ +<testcase> +<info> +<keywords> +FTP +PASV +CWD +--ftp-method +singlecwd +</keywords> +</info> +# +# Server-side +<reply> +</reply> + +# Client-side +<client> +<server> +ftp +</server> + <name> +FTP using %00 in path with singlecwd + </name> + <command> +--ftp-method singlecwd ftp://%HOSTIP:%FTPPORT/%00first/second/third/340 +</command> +</client> + +# Verify data after the test has been "shot" +<verify> +<protocol> +USER anonymous +PASS ftp@example.com +PWD +</protocol> +<errorcode> +3 +</errorcode> +</verify> +</testcase> Index: curl-7.37.0/tests/data/Makefile.am =================================================================== --- curl-7.37.0.orig/tests/data/Makefile.am +++ curl-7.37.0/tests/data/Makefile.am @@ -39,6 +39,9 @@ test298 test299 test300 test301 test302 test307 test308 test309 test310 test311 test312 test313 \ test317 test318 test320 test321 test322 test323 test324 \ test325 \ +\ +test340 \ +\ test350 test351 test352 test353 test354 \ \ test400 test401 test402 test403 test404 test405 test406 test407 test408 \ Index: curl-7.37.0/tests/data/Makefile.in =================================================================== --- curl-7.37.0.orig/tests/data/Makefile.in +++ curl-7.37.0/tests/data/Makefile.in @@ -347,6 +347,9 @@ test298 test299 test300 test301 test302 test307 test308 test309 test310 test311 test312 test313 \ test317 test318 test320 test321 test322 test323 test324 \ test325 \ +\ +test340 \ +\ test350 test351 test352 test353 test354 \ \ test400 test401 test402 test403 test404 test405 test406 test407 test408 \
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