You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.7 KiB
48 lines
1.7 KiB
From 3dbac7fb8b39a4f9aa871401d9d2790f0583ba01 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Stenberg <daniel@haxx.se>
|
|
Date: Sat, 12 Jun 2021 18:25:15 +0200
|
|
Subject: [PATCH] telnet: fix option parser to not send uninitialized contents
|
|
|
|
CVE-2021-22925
|
|
|
|
Reported-by: Red Hat Product Security
|
|
Bug: https://curl.se/docs/CVE-2021-22925.html
|
|
|
|
Upstream-commit: 894f6ec730597eb243618d33cc84d71add8d6a8a
|
|
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
|
---
|
|
lib/telnet.c | 17 +++++++++++------
|
|
1 file changed, 11 insertions(+), 6 deletions(-)
|
|
|
|
diff --git a/lib/telnet.c b/lib/telnet.c
|
|
index fdd137f..567c22c 100644
|
|
--- a/lib/telnet.c
|
|
+++ b/lib/telnet.c
|
|
@@ -922,12 +922,17 @@ static void suboption(struct Curl_easy *data)
|
|
size_t tmplen = (strlen(v->data) + 1);
|
|
/* Add the variable only if it fits */
|
|
if(len + tmplen < (int)sizeof(temp)-6) {
|
|
- if(sscanf(v->data, "%127[^,],%127s", varname, varval) == 2) {
|
|
- msnprintf((char *)&temp[len], sizeof(temp) - len,
|
|
- "%c%s%c%s", CURL_NEW_ENV_VAR, varname,
|
|
- CURL_NEW_ENV_VALUE, varval);
|
|
- len += tmplen;
|
|
- }
|
|
+ int rv;
|
|
+ char sep[2] = "";
|
|
+ varval[0] = 0;
|
|
+ rv = sscanf(v->data, "%127[^,]%1[,]%127s", varname, sep, varval);
|
|
+ if(rv == 1)
|
|
+ len += msnprintf((char *)&temp[len], sizeof(temp) - len,
|
|
+ "%c%s", CURL_NEW_ENV_VAR, varname);
|
|
+ else if(rv >= 2)
|
|
+ len += msnprintf((char *)&temp[len], sizeof(temp) - len,
|
|
+ "%c%s%c%s", CURL_NEW_ENV_VAR, varname,
|
|
+ CURL_NEW_ENV_VALUE, varval);
|
|
}
|
|
}
|
|
msnprintf((char *)&temp[len], sizeof(temp) - len,
|
|
--
|
|
2.31.1
|
|
|