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Providing a kill switch for scp to deal with CVE-2020-15778

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Resolves: RHEL-22870
This commit is contained in:
Dmitry Belyavskiy 2024-02-06 12:32:38 +01:00
parent ff2aae200d
commit 13cf39f11a
2 changed files with 54 additions and 1 deletions
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46
openssh-8.7p1-scp-kill-switch.patch Normal file
View File

@ -0,0 +1,46 @@
diff -up openssh-8.7p1/pathnames.h.kill-scp openssh-8.7p1/pathnames.h
--- openssh-8.7p1/pathnames.h.kill-scp 2021-09-16 11:37:57.240171687 +0200
+++ openssh-8.7p1/pathnames.h 2021-09-16 11:42:29.183427917 +0200
@@ -42,6 +42,7 @@
#define _PATH_HOST_XMSS_KEY_FILE SSHDIR "/ssh_host_xmss_key"
#define _PATH_HOST_RSA_KEY_FILE SSHDIR "/ssh_host_rsa_key"
#define _PATH_DH_MODULI SSHDIR "/moduli"
+#define _PATH_SCP_KILL_SWITCH SSHDIR "/disable_scp"
#ifndef _PATH_SSH_PROGRAM
#define _PATH_SSH_PROGRAM "/usr/bin/ssh"
diff -up openssh-8.7p1/scp.1.kill-scp openssh-8.7p1/scp.1
--- openssh-8.7p1/scp.1.kill-scp 2021-09-16 12:09:02.646714578 +0200
+++ openssh-8.7p1/scp.1 2021-09-16 12:26:49.978628226 +0200
@@ -278,6 +278,13 @@ to print debugging messages about their
This is helpful in
debugging connection, authentication, and configuration problems.
.El
+.Pp
+Usage of SCP protocol can be blocked by creating a world-readable
+.Ar /etc/ssh/disable_scp
+file. If this file exists, when SCP protocol is in use (either remotely or
+via the
+.Fl O
+option), the program will exit.
.Sh EXIT STATUS
.Ex -std scp
.Sh SEE ALSO
diff -up openssh-8.7p1/scp.c.kill-scp openssh-8.7p1/scp.c
--- openssh-8.7p1/scp.c.kill-scp 2021-09-16 11:42:56.013650519 +0200
+++ openssh-8.7p1/scp.c 2021-09-16 11:53:03.249713836 +0200
@@ -596,6 +596,14 @@ main(int argc, char **argv)
argc -= optind;
argv += optind;
+ {
+ FILE *f = fopen(_PATH_SCP_KILL_SWITCH, "r");
+ if (f != NULL) {
+ fclose(f);
+ fatal("SCP protocol is forbidden via %s", _PATH_SCP_KILL_SWITCH);
+ }
+ }
+
if ((pwd = getpwuid(userid = getuid())) == NULL)
fatal("unknown user %u", (u_int) userid);

9
openssh.spec
View File

@ -66,7 +66,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%global openssh_ver 8.0p1
%global openssh_rel 23
%global openssh_rel 24
%global pam_ssh_agent_ver 0.10.3
%global pam_ssh_agent_rel 7
@ -290,6 +290,8 @@ Patch1017: openssh-9.4p2-limit-delay.patch
Patch1018: openssh-9.6p1-CVE-2023-48795.patch
#upstream commit 7ef3787c84b6b524501211b11a26c742f829af1a
Patch1019: openssh-9.6p1-CVE-2023-51385.patch
# SCP kill switch
Patch1020: openssh-8.7p1-scp-kill-switch.patch
License: BSD
Group: Applications/Internet
@ -536,6 +538,7 @@ popd
%patch1017 -p1 -b .limitdelay
%patch1018 -p1 -b .cve-2023-48795
%patch1019 -p1 -b .cve-2023-51385
%patch1020 -p1 -b .scp-kill-switch
autoreconf
pushd pam_ssh_agent_auth-%{pam_ssh_agent_ver}
@ -821,6 +824,10 @@ getent passwd sshd >/dev/null || \
%endif
%changelog
* Tue Feb 06 2024 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.0p1-24
- Providing a kill switch for scp to deal with CVE-2020-15778
Resolves: RHEL-22870
* Fri Jan 05 2024 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.0p1-23
- Fix Terrapin attack
Resolves: RHEL-19308