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Resolves: CVE-2021-22925 - fix TELNET stack contents disclosure again

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This commit is contained in:
Kamil Dudka 2021-07-21 17:49:46 +02:00
parent 422b232978
commit 62ea6c3a17
2 changed files with 52 additions and 0 deletions
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47
0006-curl-7.76.1-CVE-2021-22925.patch Normal file
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@ -0,0 +1,47 @@
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

5
curl.spec
View File

@ -20,6 +20,9 @@ Patch4: 0004-curl-7.76.1-ldaps-segv.patch
# fix bad connection reuse due to flawed path name checks (CVE-2021-22924)
Patch5: 0005-curl-7.76.1-CVE-2021-22924.patch
# fix TELNET stack contents disclosure again (CVE-2021-22925)
Patch6: 0006-curl-7.76.1-CVE-2021-22925.patch
# patch making libcurl multilib ready
Patch101: 0101-curl-7.32.0-multilib.patch
@ -199,6 +202,7 @@ be installed.
%patch3 -p1
%patch4 -p1
%patch5 -p1
%patch6 -p1
# Fedora patches
%patch101 -p1
@ -379,6 +383,7 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
%changelog
* Wed Jul 21 2021 Kamil Dudka <kdudka@redhat.com> - 7.76.1-7
- fix TELNET stack contents disclosure again (CVE-2021-22925)
- fix bad connection reuse due to flawed path name checks (CVE-2021-22924)
* Tue Jun 15 2021 Mohan Boddu <mboddu@redhat.com> - 7.76.1-6