diff options
Diffstat (limited to 'meta/recipes-connectivity/openssh/openssh/CVE-2023-38408-0004.patch')
| -rw-r--r-- | meta/recipes-connectivity/openssh/openssh/CVE-2023-38408-0004.patch | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/openssh/openssh/CVE-2023-38408-0004.patch b/meta/recipes-connectivity/openssh/openssh/CVE-2023-38408-0004.patch new file mode 100644 index 0000000000..1ff8505938 --- /dev/null +++ b/meta/recipes-connectivity/openssh/openssh/CVE-2023-38408-0004.patch @@ -0,0 +1,114 @@ +From 1f2731f5d7a8f8a8385c6031667ed29072c0d92a Mon Sep 17 00:00:00 2001 +From: "djm@openbsd.org" <djm@openbsd.org> +Date: Wed, 19 Jul 2023 13:56:33 +0000 +Subject: [PATCH 4/4] upstream: Disallow remote addition of FIDO/PKCS11 + provider libraries to ssh-agent by default. + +The old behaviour of allowing remote clients from loading providers +can be restored using `ssh-agent -O allow-remote-pkcs11`. + +Detection of local/remote clients requires a ssh(1) that supports +the `session-bind@openssh.com` extension. Forwarding access to a +ssh-agent socket using non-OpenSSH tools may circumvent this control. + +ok markus@ + +OpenBSD-Commit-ID: 4c2bdf79b214ae7e60cc8c39a45501344fa7bd7c + +Upstream-Status: Backport [https://github.com/openssh/openssh-portable/commit/1f2731f5d7a8f8a8385c6031667ed29072c0d92a] + +CVE: CVE-2023-38408 + +Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com> +--- + ssh-agent.1 | 21 +++++++++++++++++++++ + ssh-agent.c | 21 ++++++++++++++++++++- + 2 files changed, 41 insertions(+), 1 deletion(-) + +diff --git a/ssh-agent.1 b/ssh-agent.1 +index ed8c870..15d0a47 100644 +--- a/ssh-agent.1 ++++ b/ssh-agent.1 +@@ -102,6 +102,27 @@ The default is + Kill the current agent (given by the + .Ev SSH_AGENT_PID + environment variable). ++Currently two options are supported: ++.Cm allow-remote-pkcs11 ++and ++.Cm no-restrict-websafe . ++.Pp ++The ++.Cm allow-remote-pkcs11 ++option allows clients of a forwarded ++.Nm ++to load PKCS#11 or FIDO provider libraries. ++By default only local clients may perform this operation. ++Note that signalling that a ++.Nm ++client remote is performed by ++.Xr ssh 1 , ++and use of other tools to forward access to the agent socket may circumvent ++this restriction. ++.Pp ++The ++.Cm no-restrict-websafe , ++instructs + .It Fl P Ar allowed_providers + Specify a pattern-list of acceptable paths for PKCS#11 provider and FIDO + authenticator middleware shared libraries that may be used with the +diff --git a/ssh-agent.c b/ssh-agent.c +index 03ae2b0..19eeaae 100644 +--- a/ssh-agent.c ++++ b/ssh-agent.c +@@ -171,6 +171,12 @@ char socket_dir[PATH_MAX]; + /* Pattern-list of allowed PKCS#11/Security key paths */ + static char *allowed_providers; + ++/* ++ * Allows PKCS11 providers or SK keys that use non-internal providers to ++ * be added over a remote connection (identified by session-bind@openssh.com). ++ */ ++static int remote_add_provider; ++ + /* locking */ + #define LOCK_SIZE 32 + #define LOCK_SALT_SIZE 16 +@@ -1239,6 +1245,12 @@ process_add_identity(SocketEntry *e) + if (strcasecmp(sk_provider, "internal") == 0) { + debug_f("internal provider"); + } else { ++ if (e->nsession_ids != 0 && !remote_add_provider) { ++ verbose("failed add of SK provider \"%.100s\": " ++ "remote addition of providers is disabled", ++ sk_provider); ++ goto out; ++ } + if (realpath(sk_provider, canonical_provider) == NULL) { + verbose("failed provider \"%.100s\": " + "realpath: %s", sk_provider, +@@ -1402,6 +1414,11 @@ process_add_smartcard_key(SocketEntry *e) + error_f("failed to parse constraints"); + goto send; + } ++ if (e->nsession_ids != 0 && !remote_add_provider) { ++ verbose("failed PKCS#11 add of \"%.100s\": remote addition of " ++ "providers is disabled", provider); ++ goto send; ++ } + if (realpath(provider, canonical_provider) == NULL) { + verbose("failed PKCS#11 add of \"%.100s\": realpath: %s", + provider, strerror(errno)); +@@ -2061,7 +2078,9 @@ main(int ac, char **av) + break; + case 'O': + if (strcmp(optarg, "no-restrict-websafe") == 0) +- restrict_websafe = 0; ++ restrict_websafe = 0; ++ else if (strcmp(optarg, "allow-remote-pkcs11") == 0) ++ remote_add_provider = 1; + else + fatal("Unknown -O option"); + break; +-- +2.40.0 |