curl/0029-curl-7.61.1-CVE-2021-22876.patch

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From 239f8d93866605b05f4e6b551f4327dc7fcb922b Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Tue, 23 Feb 2021 14:54:46 +0100
Subject: [PATCH 1/2] transfer: strip credentials from the auto-referer header
field
Added test 2081 to verify.
CVE-2021-22876
Bug: https://curl.se/docs/CVE-2021-22876.html
Upstream-commit: 7214288898f5625a6cc196e22a74232eada7861c
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/transfer.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/lib/transfer.c b/lib/transfer.c
index ecd1063..263b178 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -1473,6 +1473,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
/* Location: redirect */
bool disallowport = FALSE;
bool reachedmax = FALSE;
+ CURLUcode uc;
if(type == FOLLOW_REDIR) {
if((data->set.maxredirs != -1) &&
@@ -1488,6 +1489,9 @@ CURLcode Curl_follow(struct Curl_easy *data,
data->set.followlocation++; /* count location-followers */
if(data->set.http_auto_referer) {
+ CURLU *u;
+ char *referer;
+
/* We are asked to automatically set the previous URL as the referer
when we get the next URL. We pick the ->url field, which may or may
not be 100% correct */
@@ -1497,9 +1501,26 @@ CURLcode Curl_follow(struct Curl_easy *data,
data->change.referer_alloc = FALSE;
}
- data->change.referer = strdup(data->change.url);
- if(!data->change.referer)
+ /* Make a copy of the URL without crenditals and fragment */
+ u = curl_url();
+ if(!u)
+ return CURLE_OUT_OF_MEMORY;
+
+ uc = curl_url_set(u, CURLUPART_URL, data->change.url, 0);
+ if(!uc)
+ uc = curl_url_set(u, CURLUPART_FRAGMENT, NULL, 0);
+ if(!uc)
+ uc = curl_url_set(u, CURLUPART_USER, NULL, 0);
+ if(!uc)
+ uc = curl_url_set(u, CURLUPART_PASSWORD, NULL, 0);
+ if(!uc)
+ uc = curl_url_get(u, CURLUPART_URL, &referer, 0);
+
+ curl_url_cleanup(u);
+
+ if(uc || referer == NULL)
return CURLE_OUT_OF_MEMORY;
+ data->change.referer = referer;
data->change.referer_alloc = TRUE; /* yes, free this later */
}
}
--
2.30.2
From f7d1d478b87499ce31d6aa3251830b78447ad952 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 29 Mar 2021 09:32:14 +0200
Subject: [PATCH 2/2] transfer: clear 'referer' in declaration
To silence (false positive) compiler warnings about it.
Follow-up to 7214288898f5625
Reviewed-by: Marcel Raad
Closes #6810
Upstream-commit: 6bb028dbda6cbfe83f66de773544f71e4813160f
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/transfer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/transfer.c b/lib/transfer.c
index 263b178..ad5a7ba 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -1490,7 +1490,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
if(data->set.http_auto_referer) {
CURLU *u;
- char *referer;
+ char *referer = NULL;
/* We are asked to automatically set the previous URL as the referer
when we get the next URL. We pick the ->url field, which may or may
@@ -1518,7 +1518,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
curl_url_cleanup(u);
- if(uc || referer == NULL)
+ if(uc || !referer)
return CURLE_OUT_OF_MEMORY;
data->change.referer = referer;
data->change.referer_alloc = TRUE; /* yes, free this later */
--
2.30.2