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authorLeo Famulari <leo@famulari.name>2021-06-13 14:44:16 -0400
committerLeo Famulari <leo@famulari.name>2021-06-13 14:45:19 -0400
commitee48e784b9c5f77338224114fd1e27a1a63103aa (patch)
treec7626cad4f6bde4f3f417759e187981223171d25 /gnu/packages/patches
parent7b7399594e1e7701b23e4515fd5fc9d69a622d8c (diff)
downloadguix-ee48e784b9c5f77338224114fd1e27a1a63103aa.tar
guix-ee48e784b9c5f77338224114fd1e27a1a63103aa.tar.gz
gnu: connman: Fix CVE-2021-33833.
* gnu/packages/patches/connman-CVE-2021-33833.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/connman.scm (connman)[source]: Use it.
Diffstat (limited to 'gnu/packages/patches')
-rw-r--r--gnu/packages/patches/connman-CVE-2021-33833.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/gnu/packages/patches/connman-CVE-2021-33833.patch b/gnu/packages/patches/connman-CVE-2021-33833.patch
new file mode 100644
index 0000000000..3e1a19d961
--- /dev/null
+++ b/gnu/packages/patches/connman-CVE-2021-33833.patch
@@ -0,0 +1,74 @@
+Fix CVE-2021-33833:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33833
+
+Patch copied from upstream source repository:
+
+https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=eceb2e8d2341c041df55a5e2f047d9a8c491463c
+
+From eceb2e8d2341c041df55a5e2f047d9a8c491463c Mon Sep 17 00:00:00 2001
+From: Valery Kashcheev <v.kascheev@omp.ru>
+Date: Mon, 7 Jun 2021 18:58:24 +0200
+Subject: [PATCH] dnsproxy: Check the length of buffers before memcpy
+
+Fix using a stack-based buffer overflow attack by checking the length of
+the ptr and uptr buffers.
+
+Fix debug message output.
+
+Fixes: CVE-2021-33833
+---
+ src/dnsproxy.c | 20 +++++++++++---------
+ 1 file changed, 11 insertions(+), 9 deletions(-)
+
+diff --git a/src/dnsproxy.c b/src/dnsproxy.c
+index de52df5a..38dbdd71 100644
+--- a/src/dnsproxy.c
++++ b/src/dnsproxy.c
+@@ -1788,17 +1788,15 @@ static char *uncompress(int16_t field_count, char *start, char *end,
+ * tmp buffer.
+ */
+
+- debug("pos %d ulen %d left %d name %s", pos, ulen,
+- (int)(uncomp_len - (uptr - uncompressed)), uptr);
+-
+- ulen = strlen(name);
+- if ((uptr + ulen + 1) > uncomp_end) {
++ ulen = strlen(name) + 1;
++ if ((uptr + ulen) > uncomp_end)
+ goto out;
+- }
+- strncpy(uptr, name, uncomp_len - (uptr - uncompressed));
++ strncpy(uptr, name, ulen);
++
++ debug("pos %d ulen %d left %d name %s", pos, ulen,
++ (int)(uncomp_end - (uptr + ulen)), uptr);
+
+ uptr += ulen;
+- *uptr++ = '\0';
+
+ ptr += pos;
+
+@@ -1841,7 +1839,7 @@ static char *uncompress(int16_t field_count, char *start, char *end,
+ } else if (dns_type == ns_t_a || dns_type == ns_t_aaaa) {
+ dlen = uptr[-2] << 8 | uptr[-1];
+
+- if (ptr + dlen > end) {
++ if ((ptr + dlen) > end || (uptr + dlen) > uncomp_end) {
+ debug("data len %d too long", dlen);
+ goto out;
+ }
+@@ -1880,6 +1878,10 @@ static char *uncompress(int16_t field_count, char *start, char *end,
+ * refresh interval, retry interval, expiration
+ * limit and minimum ttl). They are 20 bytes long.
+ */
++ if ((uptr + 20) > uncomp_end || (ptr + 20) > end) {
++ debug("soa record too long");
++ goto out;
++ }
+ memcpy(uptr, ptr, 20);
+ uptr += 20;
+ ptr += 20;
+--
+2.32.0
+