From 1e6f9bb225047cb40232ac3e0aa5da161e49d465 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 25 Sep 2017 00:35:22 +0200
Subject: [PATCH] FTP: zero terminate the entry path even on bad input
... a single double quote could leave the entry path buffer without a zero
terminating byte. CVE-2017-1000254
Test 1152 added to verify.
Reported-by: Max Dymond
Bug: https://curl.haxx.se/docs/adv_20171004.html
Upstream-commit: 5ff2c5ff25750aba1a8f64fbcad8e5b891512584
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/ftp.c | 7 ++++--
tests/data/Makefile.inc | 1 +
tests/data/test1152 | 61 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+), 2 deletions(-)
create mode 100644 tests/data/test1152
diff --git a/lib/ftp.c b/lib/ftp.c
index 6e86e53..bcba6bb 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -2777,6 +2777,7 @@ static CURLcode ftp_statemach_act(struct connectdata *conn)
const size_t buf_size = data->set.buffer_size;
char *dir;
char *store;
+ bool entry_extracted = FALSE;
dir = malloc(nread + 1);
if(!dir)
@@ -2808,7 +2809,7 @@ static CURLcode ftp_statemach_act(struct connectdata *conn)
}
else {
/* end of path */
- *store = '\0'; /* zero terminate */
+ entry_extracted = TRUE;
break; /* get out of this loop */
}
}
@@ -2817,7 +2818,9 @@ static CURLcode ftp_statemach_act(struct connectdata *conn)
store++;
ptr++;
}
-
+ *store = '\0'; /* zero terminate */
+ }
+ if(entry_extracted) {
/* If the path name does not look like an absolute path (i.e.: it
does not start with a '/'), we probably need some server-dependent
adjustments. For example, this is the case when connecting to
diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
index 1657ac6..f8f6e41 100644
--- a/tests/data/Makefile.inc
+++ b/tests/data/Makefile.inc
@@ -121,6 +121,7 @@ test1120 test1121 test1122 test1123 test1124 test1125 test1126 test1127 \
test1128 test1129 test1130 test1131 test1132 test1133 test1134 test1135 \
test1136 test1137 test1138 test1139 test1140 test1141 test1142 test1143 \
test1144 test1145 test1146 test1147 test1148 \
+test1152 \
test1200 test1201 test1202 test1203 test1204 test1205 test1206 test1207 \
test1208 test1209 test1210 test1211 test1212 test1213 test1214 test1215 \
test1216 test1217 test1218 test1219 \
diff --git a/tests/data/test1152 b/tests/data/test1152
new file mode 100644
index 0000000..aa8c0a7
--- /dev/null
+++ b/tests/data/test1152
@@ -0,0 +1,61 @@
+<testcase>
+<info>
+<keywords>
+FTP
+PASV
+LIST
+</keywords>
+</info>
+#
+# Server-side
+<reply>
+<servercmd>
+REPLY PWD 257 "just one
+</servercmd>
+
+# When doing LIST, we get the default list output hard-coded in the test
+# FTP server
+<data mode="text">
+total 20
+drwxr-xr-x 8 98 98 512 Oct 22 13:06 .
+drwxr-xr-x 8 98 98 512 Oct 22 13:06 ..
+drwxr-xr-x 2 98 98 512 May 2 1996 curl-releases
+-r--r--r-- 1 0 1 35 Jul 16 1996 README
+lrwxrwxrwx 1 0 1 7 Dec 9 1999 bin -> usr/bin
+dr-xr-xr-x 2 0 1 512 Oct 1 1997 dev
+drwxrwxrwx 2 98 98 512 May 29 16:04 download.html
+dr-xr-xr-x 2 0 1 512 Nov 30 1995 etc
+drwxrwxrwx 2 98 1 512 Oct 30 14:33 pub
+dr-xr-xr-x 5 0 1 512 Oct 1 1997 usr
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+ftp
+</server>
+ <name>
+FTP with uneven quote in PWD response
+ </name>
+ <command>
+ftp://%HOSTIP:%FTPPORT/test-1152/
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+USER anonymous
+PASS ftp@example.com
+PWD
+CWD test-1152
+EPSV
+TYPE A
+LIST
+QUIT
+</protocol>
+</verify>
+</testcase>
--
2.13.6