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

0002-curl-7.76.1-CVE-2021-22898.patch

@@ -0,0 +1,31 @@
+From 886f7458bbf005299f3f8224103d1903cd6fa7a4 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 f96a4cb..4551435 100644
+--- a/lib/telnet.c
++++ b/lib/telnet.c
+@@ -921,7 +921,7 @@ 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)) {
++          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

@@ -1,13 +1,16 @@
 Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
 Name: curl
 Version: 7.76.1
-Release: 2%{?dist}
+Release: 3%{?dist}
 License: MIT
 Source: https://curl.se/download/%{name}-%{version}.tar.xz
 
 # http2: fix resource leaks detected by Coverity
 Patch1:   0001-curl-7.76.1-resource-leaks.patch
 
+# fix TELNET stack contents disclosure (CVE-2021-22898)
+Patch2:   0002-curl-7.76.1-CVE-2021-22898.patch
+
 # patch making libcurl multilib ready
 Patch101: 0101-curl-7.32.0-multilib.patch
 
@@ -184,6 +187,7 @@ be installed.
 
 # upstream patches
 %patch1 -p1
+%patch2 -p1
 
 # Fedora patches
 %patch101 -p1
@@ -364,6 +368,9 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
 %{_libdir}/libcurl.so.4.[0-9].[0-9].minimal
 
 %changelog
+* Wed May 26 2021 Kamil Dudka <kdudka@redhat.com> - 7.76.1-3
+- fix TELNET stack contents disclosure (CVE-2021-22898)
+
 * Mon May 03 2021 Kamil Dudka <kdudka@redhat.com> - 7.76.1-2
 - http2: fix resource leaks detected by Coverity