Package: release.debian.org
Severity: normal
Tags: buster
User: release.debian....@packages.debian.org
Usertags: pu
Hello,
I am seeking permission to upload a new version of tcpdump to
stable-proposed-updates to address CVE-2020-8037 (bug #973877).
Full debdiff attached.
Thanks,
diffstat for tcpdump-4.9.3 tcpdump-4.9.3
changelog | 7 ++++
patches/series | 1
patches/upstream-32027e1993.diff | 61 +++++++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
diff -Nru tcpdump-4.9.3/debian/changelog tcpdump-4.9.3/debian/changelog
--- tcpdump-4.9.3/debian/changelog 2019-10-19 16:55:18.000000000 +0200
+++ tcpdump-4.9.3/debian/changelog 2020-11-07 13:36:24.000000000 +0100
@@ -1,3 +1,10 @@
+tcpdump (4.9.3-1~deb10u2) buster; urgency=high
+
+ * Cherry-pick commit 32027e1993 from the upstream tcpdump-4.9 branch to fix
+ untrusted input issue in the PPP printer (CVE-2020-8037, closes: #973877).
+
+ -- Romain Francoise <rfranco...@debian.org> Sat, 07 Nov 2020 13:36:24 +0100
+
tcpdump (4.9.3-1~deb10u1) buster-security; urgency=high
* New upstream release, with fixes for 24 different CVEs (closes: #941698).
diff -Nru tcpdump-4.9.3/debian/patches/series
tcpdump-4.9.3/debian/patches/series
--- tcpdump-4.9.3/debian/patches/series 2019-10-19 00:20:22.000000000 +0200
+++ tcpdump-4.9.3/debian/patches/series 2020-11-07 13:34:47.000000000 +0100
@@ -2,3 +2,4 @@
man-section.diff
platform-quirks.diff
disable-tests.diff
+upstream-32027e1993.diff
diff -Nru tcpdump-4.9.3/debian/patches/upstream-32027e1993.diff
tcpdump-4.9.3/debian/patches/upstream-32027e1993.diff
--- tcpdump-4.9.3/debian/patches/upstream-32027e1993.diff 1970-01-01
01:00:00.000000000 +0100
+++ tcpdump-4.9.3/debian/patches/upstream-32027e1993.diff 2020-11-07
13:34:39.000000000 +0100
@@ -0,0 +1,61 @@
+commit 32027e199368dad9508965aae8cd8de5b6ab5231
+Author: Guy Harris <g...@alum.mit.edu>
+Date: Sat Apr 18 14:04:59 2020 -0700
+
+ PPP: When un-escaping, don't allocate a too-large buffer.
+
+ The buffer should be big enough to hold the captured data, but it
+ doesn't need to be big enough to hold the entire on-the-network packet,
+ if we haven't captured all of it.
+
+ (backported from commit e4add0b010ed6f2180dcb05a13026242ed935334)
+
+diff --git a/print-ppp.c b/print-ppp.c
+index 891761728b..33fb034127 100644
+--- a/print-ppp.c
++++ b/print-ppp.c
+@@ -1367,19 +1367,29 @@ trunc:
+ return 0;
+ }
+
++/*
++ * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes.
++ * The length argument is the on-the-wire length, not the captured
++ * length; we can only un-escape the captured part.
++ */
+ static void
+ ppp_hdlc(netdissect_options *ndo,
+ const u_char *p, int length)
+ {
++ u_int caplen = ndo->ndo_snapend - p;
+ u_char *b, *t, c;
+ const u_char *s;
+- int i, proto;
++ u_int i;
++ int proto;
+ const void *se;
+
++ if (caplen == 0)
++ return;
++
+ if (length <= 0)
+ return;
+
+- b = (u_char *)malloc(length);
++ b = (u_char *)malloc(caplen);
+ if (b == NULL)
+ return;
+
+@@ -1388,10 +1398,10 @@ ppp_hdlc(netdissect_options *ndo,
+ * Do this so that we dont overwrite the original packet
+ * contents.
+ */
+- for (s = p, t = b, i = length; i > 0 && ND_TTEST(*s); i--) {
++ for (s = p, t = b, i = caplen; i != 0; i--) {
+ c = *s++;
+ if (c == 0x7d) {
+- if (i <= 1 || !ND_TTEST(*s))
++ if (i <= 1)
+ break;
+ i--;
+ c = *s++ ^ 0x20;
