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libssh2_org-CVE-2023-48795-ext.patch
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65
libssh2_org-CVE-2023-48795-ext.patch
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From 59786b186d4de8fd6cd5aeebedbce2362a849566 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Josef=20=C4=8Cejka?= <jcejka@suse.cz>
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Date: Tue, 6 Feb 2024 15:14:29 +0100
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Subject: [PATCH] Always add extension indicators to kex_algorithms
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KEX pseudo-methods "ext-info-c" and "kex-strict-c-v00@openssh.com"
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are in default kex method list but they were lost
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after configuring custom kex method list in libssh2_session_method_pref().
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---
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src/kex.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/src/kex.c b/src/kex.c
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index 8c65a0fe..1d1dadfa 100644
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--- a/src/kex.c
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+++ b/src/kex.c
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@@ -4027,13 +4027,25 @@ libssh2_session_method_pref(LIBSSH2_SESSION * session, int method_type,
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const char *prefs)
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{
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char **prefvar, *s, *newprefs;
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+ char *tmpprefs = NULL;
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size_t prefs_len = strlen(prefs);
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const LIBSSH2_COMMON_METHOD **mlist;
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+ const char *kex_extensions = "ext-info-c,kex-strict-c-v00@openssh.com,";
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+ size_t kex_extensions_len = strlen(kex_extensions);
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switch(method_type) {
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case LIBSSH2_METHOD_KEX:
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prefvar = &session->kex_prefs;
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mlist = (const LIBSSH2_COMMON_METHOD **)libssh2_kex_methods;
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+ tmpprefs = LIBSSH2_ALLOC(session, kex_extensions_len + prefs_len + 1);
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+ if(!tmpprefs) {
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+ return _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
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+ "Error allocated space for kex method preferences");
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+ }
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+ memcpy(tmpprefs, kex_extensions, kex_extensions_len);
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+ memcpy(tmpprefs + kex_extensions_len, prefs, prefs_len + 1);
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+ prefs = tmpprefs;
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+ prefs_len = strlen(prefs);
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break;
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case LIBSSH2_METHOD_HOSTKEY:
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@@ -4093,6 +4105,9 @@ libssh2_session_method_pref(LIBSSH2_SESSION * session, int method_type,
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s = newprefs = LIBSSH2_ALLOC(session, prefs_len + 1);
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if(!newprefs) {
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+ if (tmpprefs) {
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+ LIBSSH2_FREE(session, tmpprefs);
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+ }
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return _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
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"Error allocated space for method preferences");
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}
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@@ -4121,6 +4136,10 @@ libssh2_session_method_pref(LIBSSH2_SESSION * session, int method_type,
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}
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}
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+ if (tmpprefs) {
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+ LIBSSH2_FREE(session, tmpprefs);
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+ }
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+
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if(!*newprefs) {
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LIBSSH2_FREE(session, newprefs);
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return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
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--
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2.26.2
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26
libssh2_org-ETM-remote.patch
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libssh2_org-ETM-remote.patch
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From bde10825f1271769d56a0e99793da61d37abc23c Mon Sep 17 00:00:00 2001
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From: Josef Cejka <jcejka@suse.com>
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Date: Thu, 28 Mar 2024 23:38:47 +0100
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Subject: [PATCH] transport: check ETM on remote end when receiving (#1332)
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We should check if encrypt-then-MAC feature is enabled in remote end's
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configuration.
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Fixes #1331
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---
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src/transport.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/transport.c b/src/transport.c
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index 531f5aa15a..af175d3fa1 100644
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--- a/src/transport.c
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+++ b/src/transport.c
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@@ -425,7 +425,7 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
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make the checks below work fine still */
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}
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- etm = encrypted && session->local.mac ? session->local.mac->etm : 0;
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+ etm = encrypted && session->remote.mac ? session->remote.mac->etm : 0;
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/* read/use a whole big chunk into a temporary area stored in
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the LIBSSH2_SESSION struct. We will decrypt data from that
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@ -1,3 +1,21 @@
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-------------------------------------------------------------------
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Tue Apr 2 16:48:26 UTC 2024 - Pedro Monreal <pmonreal@suse.com>
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- Fix an issue with Encrypt-then-MAC family. [bsc#1221622]
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* Test the ETM feature in the remote end's configuration when
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receiving data. Upstream issue: #1331.
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* Add libssh2_org-ETM-remote.patch
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-------------------------------------------------------------------
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Fri Feb 9 14:55:47 UTC 2024 - Pedro Monreal <pmonreal@suse.com>
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- Always add the KEX pseudo-methods "ext-info-c" and "kex-strict-c-v00@openssh.com"
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when configuring custom method list. [bsc#1218971, CVE-2023-48795]
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* The strict-kex extension is announced in the list of available
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KEX methods. However, when the default KEX method list is modified
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or replaced, the extension is not added back automatically.
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* Add libssh2_org-CVE-2023-48795-ext.patch
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-------------------------------------------------------------------
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Tue Dec 19 11:25:35 UTC 2023 - Otto Hollmann <otto.hollmann@suse.com>
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@ -31,6 +31,10 @@ Source3: libssh2_org.keyring
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Patch0: libssh2-ocloexec.patch
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# PATCH-FIX-UPSTREAM bsc#1218127 CVE-2023-48795: Add 'strict KEX' to fix Terrapin Attack
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Patch1: libssh2_org-CVE-2023-48795.patch
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# PATCH-FIX-SUSE bsc#1218971 Always add extension indicators to kex_algorithms
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Patch2: libssh2_org-CVE-2023-48795-ext.patch
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# PATCH-FIX-UPSTREAM bsc#1221622 Test ETM feature in remote end's config when receiving data
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Patch3: libssh2_org-ETM-remote.patch
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BuildRequires: libtool
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BuildRequires: openssl-devel
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BuildRequires: pkgconfig
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