From cf118077cd4f909a7ad68e6efdc07fe93f63b650 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Petr=20=C5=A0tetiar?= Date: Thu, 20 Feb 2020 09:03:54 +0100 Subject: ppp: backport security fixes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 8d45443bb5c9 pppd: Ignore received EAP messages when not doing EAP 8d7970b8f3db pppd: Fix bounds check in EAP code 858976b1fc31 radius: Prevent buffer overflow in rc_mksid() Signed-off-by: Petr Štetiar (cherry picked from commit 215598fd03899c19a9cd26266221269dd5ec8cee) Fixes: CVE-2020-8597 Signed-off-by: Jo-Philipp Wich --- .../701-pppd-Fix-bounds-check-in-EAP-code.patch | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 package/network/services/ppp/patches/701-pppd-Fix-bounds-check-in-EAP-code.patch (limited to 'package/network/services/ppp/patches/701-pppd-Fix-bounds-check-in-EAP-code.patch') diff --git a/package/network/services/ppp/patches/701-pppd-Fix-bounds-check-in-EAP-code.patch b/package/network/services/ppp/patches/701-pppd-Fix-bounds-check-in-EAP-code.patch new file mode 100644 index 0000000000..c2ca9729ec --- /dev/null +++ b/package/network/services/ppp/patches/701-pppd-Fix-bounds-check-in-EAP-code.patch @@ -0,0 +1,37 @@ +From 8d7970b8f3db727fe798b65f3377fe6787575426 Mon Sep 17 00:00:00 2001 +From: Paul Mackerras +Date: Mon, 3 Feb 2020 15:53:28 +1100 +Subject: [PATCH] pppd: Fix bounds check in EAP code + +Given that we have just checked vallen < len, it can never be the case +that vallen >= len + sizeof(rhostname). This fixes the check so we +actually avoid overflowing the rhostname array. + +Reported-by: Ilja Van Sprundel +Signed-off-by: Paul Mackerras +--- + pppd/eap.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/pppd/eap.c b/pppd/eap.c +index 94407f56a336..1b93db01aebd 100644 +--- a/pppd/eap.c ++++ b/pppd/eap.c +@@ -1420,7 +1420,7 @@ int len; + } + + /* Not so likely to happen. */ +- if (vallen >= len + sizeof (rhostname)) { ++ if (len - vallen >= sizeof (rhostname)) { + dbglog("EAP: trimming really long peer name down"); + BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1); + rhostname[sizeof (rhostname) - 1] = '\0'; +@@ -1846,7 +1846,7 @@ int len; + } + + /* Not so likely to happen. */ +- if (vallen >= len + sizeof (rhostname)) { ++ if (len - vallen >= sizeof (rhostname)) { + dbglog("EAP: trimming really long peer name down"); + BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1); + rhostname[sizeof (rhostname) - 1] = '\0'; -- cgit v1.2.3