screen: CVE-2023-24626 allows sending SIGHUP to arbitrary PIDs

Upstream-Status: Backport from https://git.savannah.gnu.org/cgit/screen.git/commit/?id=e9ad41bfedb4537a6f0de20f00b27c7739f168f7

(From OE-Core rev: cf6348b5778c9409fc330808effc69e9939e6857)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 41 insertions, 0 deletions

diff --git a/meta/recipes-extended/screen/screen/CVE-2023-24626.patch b/meta/recipes-extended/screen/screen/CVE-2023-24626.patch
new file mode 100644
index 0000000000..73caf9d81b
--- /dev/null
+++ b/meta/recipes-extended/screen/screen/CVE-2023-24626.patch
@@ -0,0 +1,40 @@
+From e9ad41bfedb4537a6f0de20f00b27c7739f168f7 Mon Sep 17 00:00:00 2001
+From: Alexander Naumov <alexander_naumov@opensuse.org>
+Date: Mon, 30 Jan 2023 17:22:25 +0200
+Subject: fix: missing signal sending permission check on failed query messages
+
+Signed-off-by: Alexander Naumov <alexander_naumov@opensuse.org>
+
+CVE: CVE-2023-24626
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/screen.git/commit/?id=e9ad41bfedb4537a6f0de20f00b27c7739f168f7]
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ socket.c | 9 +++++++--
+ 1 file changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/socket.c b/socket.c
+index bb68b35..9d87445 100644
+--- a/socket.c
++++ b/socket.c
+@@ -1285,11 +1285,16 @@ ReceiveMsg()
+           else
+             queryflag = -1;
+ 
+-          Kill(m.m.command.apid,
++          if (CheckPid(m.m.command.apid)) {
++            Msg(0, "Query attempt with bad pid(%d)!", m.m.command.apid);
++          }
++          else {
++            Kill(m.m.command.apid,
+                (queryflag >= 0)
+                    ? SIGCONT
+                    : SIG_BYE); /* Send SIG_BYE if an error happened */
+-          queryflag = -1;
++            queryflag = -1;
++          }
+         }
+         break;
+       case MSG_COMMAND:
+-- 
+2.25.1
+
diff --git a/meta/recipes-extended/screen/screen_4.9.0.bb b/meta/recipes-extended/screen/screen_4.9.0.bb
index b36173b8de..19070d87d8 100644
--- a/meta/recipes-extended/screen/screen_4.9.0.bb
+++ b/meta/recipes-extended/screen/screen_4.9.0.bb
@@ -21,6 +21,7 @@ SRC_URI = "${GNU_MIRROR}/screen/screen-${PV}.tar.gz \
            file://0002-comm.h-now-depends-on-term.h.patch \
            file://0001-fix-for-multijob-build.patch \
            file://0001-Remove-more-compatibility-stuff.patch \
+           file://CVE-2023-24626.patch \
           "
 
 SRC_URI[sha256sum] = "f9335281bb4d1538ed078df78a20c2f39d3af9a4e91c57d084271e0289c730f4"