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Code Issues Releases Wiki Activity

wildcardmatch: fix heap buffer overflow in setcharset

Browse Source 
The code would previous read beyond the end of the pattern string if the
match pattern ends with an open bracket when the default pattern
matching function is used.

Detected by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4161

CVE-2017-8817

Bug: https://curl.haxx.se/docs/adv_2017-ae72.html
This commit is contained in:
Daniel Stenberg 2017-11-10 08:52:45 +01:00
parent 9b5e12a549
commit 0b664ba968
No known key found for this signature in database
GPG Key ID: 5CC908FDB71E12C2
3 changed files with 56 additions and 7 deletions
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9
lib/curl_fnmatch.c
View File

@ -133,6 +133,9 @@ static int setcharset(unsigned char **p, unsigned char *charset)
unsigned char c;
for(;;) {
c = **p;
if(!c)
return SETCHARSET_FAIL;
switch(state) {
case CURLFNM_SCHS_DEFAULT:
if(ISALNUM(c)) { /* ASCII value */
@ -196,9 +199,6 @@ static int setcharset(unsigned char **p, unsigned char *charset)
else
return SETCHARSET_FAIL;
}
else if(c == '\0') {
return SETCHARSET_FAIL;
}
else {
charset[c] = 1;
(*p)++;
@ -274,9 +274,6 @@ static int setcharset(unsigned char **p, unsigned char *charset)
else if(c == ']') {
return SETCHARSET_OK;
}
else if(c == '\0') {
return SETCHARSET_FAIL;
}
else if(ISPRINT(c)) {
charset[c] = 1;
(*p)++;

2
tests/data/Makefile.inc
View File

@ -125,7 +125,7 @@ test1136 test1137 test1138 test1139 test1140 test1141 test1142 test1143 \
test1144 test1145 test1146 test1147 test1148 test1149 test1150 test1151 \
test1152 test1153 \
\
test1160 test1161 test1162 \
test1160 test1161 test1162 test1163 \
test1200 test1201 test1202 test1203 test1204 test1205 test1206 test1207 \
test1208 test1209 test1210 test1211 test1212 test1213 test1214 test1215 \
test1216 test1217 test1218 test1219 \

52
tests/data/test1163 Normal file
View File

@ -0,0 +1,52 @@
<testcase>
<info>
<keywords>
FTP
RETR
LIST
wildcardmatch
ftplistparser
flaky
</keywords>
</info>
#
# Server-side
<reply>
<data>
</data>
</reply>
# Client-side
<client>
<server>
ftp
</server>
<tool>
lib576
</tool>
<name>
FTP wildcard with pattern ending with an open-bracket
</name>
<command>
"ftp://%HOSTIP:%FTPPORT/fully_simulated/DOS/*[]["
</command>
</client>
<verify>
<protocol>
USER anonymous
PASS ftp@example.com
PWD
CWD fully_simulated
CWD DOS
EPSV
TYPE A
LIST
QUIT
</protocol>
# 78 == CURLE_REMOTE_FILE_NOT_FOUND
<errorcode>
78
</errorcode>
</verify>
</testcase>