Resolves: CVE-2021-22898 - fix TELNET stack contents disclosure

0011-curl-7.71.1-CVE-2021-22898.patch

@@ -0,0 +1,31 @@
+From ae2dc830fb37e9243dbdaf8b92e41df91f43b3f2 Mon Sep 17 00:00:00 2001
+From: Harry Sintonen <sintonen@iki.fi>
+Date: Fri, 7 May 2021 13:09:57 +0200
+Subject: [PATCH] telnet: check sscanf() for correct number of matches
+
+CVE-2021-22898
+
+Bug: https://curl.se/docs/CVE-2021-22898.html
+
+Upstream-commit: 39ce47f219b09c380b81f89fe54ac586c8db6bde
+Signed-off-by: Kamil Dudka <kdudka@redhat.com>
+---
+ lib/telnet.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/telnet.c b/lib/telnet.c
+index 1fc5af1..ea6bc71 100644
+--- a/lib/telnet.c
++++ b/lib/telnet.c
+@@ -967,7 +967,7 @@ static void suboption(struct connectdata *conn)
+         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)) {
++          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);
+-- 
+2.31.1
+

curl.spec

@@ -32,6 +32,9 @@ Patch9:   0009-curl-7.71.1-CVE-2021-22890.patch
 # fix bad connection reuse due to flawed path name checks (CVE-2021-22924)
 Patch10:  0010-curl-7.71.1-CVE-2021-22924.patch
 
+# fix TELNET stack contents disclosure (CVE-2021-22898)
+Patch11:  0011-curl-7.71.1-CVE-2021-22898.patch
+
 # patch making libcurl multilib ready
 Patch101: 0101-curl-7.32.0-multilib.patch
 
@@ -207,6 +210,7 @@ be installed.
 %patch8 -p1
 %patch9 -p1
 %patch10 -p1
+%patch11 -p1
 
 # Fedora patches
 %patch101 -p1
@@ -385,6 +389,7 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
 
 %changelog
 * Wed Jun 02 2021 Kamil Dudka <kdudka@redhat.com> - 7.71.1-10
+- fix TELNET stack contents disclosure (CVE-2021-22898)
 - fix bad connection reuse due to flawed path name checks (CVE-2021-22924)
 - disable metalink support to fix the following vulnerabilities
     CVE-2021-22923 - metalink download sends credentials