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Correct error code processing

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Fix missing error codes set and invalid error code checks in OpenSSH. It
prevents memory exhaustion attack and a MITM attack when VerifyHostKeyDNS
is on (CVE-2025-26465).

Resolves: RHEL-78700
This commit is contained in:
Dmitry Belyavskiy 2025-02-18 10:59:20 +01:00
parent 0fd4a1cd57
commit 2a4cfc7fd4
2 changed files with 80 additions and 1 deletions
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69
openssh-9.9p2-error_processing.patch Normal file
View File

@ -0,0 +1,69 @@
diff --git a/krl.c b/krl.c
index e2efdf06..0d0f6953 100644
--- a/krl.c
+++ b/krl.c
@@ -674,6 +674,7 @@ revoked_certs_generate(struct revoked_certs *rc, struct sshbuf *buf)
break;
case KRL_SECTION_CERT_SERIAL_BITMAP:
if (rs->lo - bitmap_start > INT_MAX) {
+ r = SSH_ERR_INVALID_FORMAT;
error_f("insane bitmap gap");
goto out;
}
@@ -1059,6 +1060,7 @@ ssh_krl_from_blob(struct sshbuf *buf, struct ssh_krl **krlp)
goto out;
if ((krl = ssh_krl_init()) == NULL) {
+ r = SSH_ERR_ALLOC_FAIL;
error_f("alloc failed");
goto out;
}
diff --git a/sshconnect2.c b/sshconnect2.c
index a69c4da1..1ee6000a 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -99,7 +99,7 @@ verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
options.required_rsa_size)) != 0)
fatal_r(r, "Bad server host key");
if (verify_host_key(xxx_host, xxx_hostaddr, hostkey,
- xxx_conn_info) == -1)
+ xxx_conn_info) != 0)
fatal("Host key verification failed.");
return 0;
}
@@ -699,6 +699,7 @@ input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
debug_f("server sent unknown pkalg %s", pkalg);
+ r = SSH_ERR_INVALID_FORMAT;
goto done;
}
if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
@@ -709,6 +710,7 @@ input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
error("input_userauth_pk_ok: type mismatch "
"for decoded key (received %d, expected %d)",
key->type, pktype);
+ r = SSH_ERR_INVALID_FORMAT;
goto done;
}
@@ -728,6 +730,7 @@ input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
SSH_FP_DEFAULT);
error_f("server replied with unknown key: %s %s",
sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
+ r = SSH_ERR_INVALID_FORMAT;
goto done;
}
ident = format_identity(id);
diff --git a/sshsig.c b/sshsig.c
index 6e03c0b0..3da005d6 100644
--- a/sshsig.c
+++ b/sshsig.c
@@ -879,6 +879,7 @@ cert_filter_principals(const char *path, u_long linenum,
}
if ((principals = sshbuf_dup_string(nprincipals)) == NULL) {
error_f("buffer error");
+ r = SSH_ERR_ALLOC_FAIL;
goto out;
}
/* success */

12
openssh.spec
View File

@ -47,7 +47,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%global openssh_ver 8.7p1
%global openssh_rel 44
%global openssh_rel 45
%global pam_ssh_agent_ver 0.10.4
%global pam_ssh_agent_rel 5
@ -297,6 +297,9 @@ Patch1022: openssh-8.7p1-redhat-help.patch
Patch1023: openssh-8.7p1-openssl-log.patch
#upstream commit 52dfe3c72d98503d8b7c6f64fc7e19d685636c0b
Patch1024: openssh-8.7p1-allow-duplicate-subsystem.patch
# upstream 6ce00f0c2ecbb9f75023dbe627ee6460bcec78c2
# upstream 0832aac79517611dd4de93ad0a83577994d9c907
Patch1025: openssh-9.9p2-error_processing.patch
License: BSD
Requires: /sbin/nologin
@ -526,6 +529,7 @@ popd
%patch1022 -p1 -b .redhat-help
%patch1023 -p1 -b .openssl-log
%patch1024 -p1 -b .allow-dup-subsystem
%patch1025 -p1 -b .errcode_set
autoreconf
pushd pam_ssh_agent_auth-pam_ssh_agent_auth-%{pam_ssh_agent_ver}
@ -813,6 +817,12 @@ test -f %{sysconfig_anaconda} && \
%endif
%changelog
* Tue Feb 18 2025 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-45
- Fix missing error codes set and invalid error code checks in OpenSSH. It
prevents memory exhaustion attack and a MITM attack when VerifyHostKeyDNS
is on (CVE-2025-26465).
Resolves: RHEL-78700
* Mon Oct 21 2024 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-44
- Add extra help information on ssh early failure
Resolves: RHEL-33809