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From 784057d777784f1737dbf5d660f32bf2577add4c Mon Sep 17 00:00:00 2001 | ||
From: Roland Shoemaker <[email protected]> | ||
Date: Tue, 3 Dec 2024 09:03:03 -0800 | ||
Subject: [PATCH] ssh: make the public key cache a 1-entry FIFO cache | ||
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Users of the the ssh package seem to extremely commonly misuse the | ||
PublicKeyCallback API, assuming that the key passed in the last call | ||
before a connection is established is the key used for authentication. | ||
Some users then make authorization decisions based on this key. This | ||
property is not documented, and may not be correct, due to the caching | ||
behavior of the package, resulting in users making incorrect | ||
authorization decisions about the connection. | ||
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This change makes the cache a one entry FIFO cache, making the assumed | ||
property, that the last call to PublicKeyCallback represents the key | ||
actually used for authentication, actually hold. | ||
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Thanks to Damien Tournoud, Patrick Dawkins, Vince Parker, and | ||
Jules Duvivier from the Platform.sh / Upsun engineering team | ||
for reporting this issue. | ||
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Fixes golang/go#70779 | ||
Fixes CVE-2024-45337 | ||
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Change-Id: Ife7c7b4045d8b6bcd7e3a417bdfae370c709797f | ||
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/635315 | ||
Reviewed-by: Roland Shoemaker <[email protected]> | ||
Auto-Submit: Gopher Robot <[email protected]> | ||
Reviewed-by: Damien Neil <[email protected]> | ||
Reviewed-by: Nicola Murino <[email protected]> | ||
LUCI-TryBot-Result: Go LUCI <[email protected]> | ||
Signed-off-by: Muhammad Falak R Wani <[email protected]> | ||
--- | ||
.../vendor/golang.org/x/crypto/ssh/server.go | 15 +++++++++++---- | ||
1 file changed, 11 insertions(+), 4 deletions(-) | ||
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diff --git a/cmd/controller/vendor/golang.org/x/crypto/ssh/server.go b/cmd/controller/vendor/golang.org/x/crypto/ssh/server.go | ||
index 3ca9e89..a8b673c 100644 | ||
--- a/cmd/controller/vendor/golang.org/x/crypto/ssh/server.go | ||
+++ b/cmd/controller/vendor/golang.org/x/crypto/ssh/server.go | ||
@@ -149,7 +149,7 @@ func (s *ServerConfig) AddHostKey(key Signer) { | ||
} | ||
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// cachedPubKey contains the results of querying whether a public key is | ||
-// acceptable for a user. | ||
+// acceptable for a user. This is a FIFO cache. | ||
type cachedPubKey struct { | ||
user string | ||
pubKeyData []byte | ||
@@ -157,7 +157,13 @@ type cachedPubKey struct { | ||
perms *Permissions | ||
} | ||
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-const maxCachedPubKeys = 16 | ||
+// maxCachedPubKeys is the number of cache entries we store. | ||
+// | ||
+// Due to consistent misuse of the PublicKeyCallback API, we have reduced this | ||
+// to 1, such that the only key in the cache is the most recently seen one. This | ||
+// forces the behavior that the last call to PublicKeyCallback will always be | ||
+// with the key that is used for authentication. | ||
+const maxCachedPubKeys = 1 | ||
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// pubKeyCache caches tests for public keys. Since SSH clients | ||
// will query whether a public key is acceptable before attempting to | ||
@@ -179,9 +185,10 @@ func (c *pubKeyCache) get(user string, pubKeyData []byte) (cachedPubKey, bool) { | ||
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// add adds the given tuple to the cache. | ||
func (c *pubKeyCache) add(candidate cachedPubKey) { | ||
- if len(c.keys) < maxCachedPubKeys { | ||
- c.keys = append(c.keys, candidate) | ||
+ if len(c.keys) >= maxCachedPubKeys { | ||
+ c.keys = c.keys[1:] | ||
} | ||
+ c.keys = append(c.keys, candidate) | ||
} | ||
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// ServerConn is an authenticated SSH connection, as seen from the | ||
-- | ||
2.34.1 | ||
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Summary: Automatically provision and manage TLS certificates in Kubernetes | ||
Name: cert-manager | ||
Version: 1.12.13 | ||
Release: 1%{?dist} | ||
Release: 2%{?dist} | ||
License: ASL 2.0 | ||
Vendor: Microsoft Corporation | ||
Distribution: Azure Linux | ||
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@@ -13,6 +13,7 @@ Source0: https://github.com/jetstack/%{name}/archive/refs/tags/v%{version | |
# 1. wget https://github.com/jetstack/%%{name}/archive/refs/tags/v%%{version}.tar.gz -O %%{name}-%%{version}.tar.gz | ||
# 2. <repo-root>/SPECS/cert-manager/generate_source_tarball.sh --srcTarball %%{name}-%%{version}.tar.gz --pkgVersion %%{version} | ||
Source1: %{name}-%{version}-vendor.tar.gz | ||
Patch0: CVE-2024-45337.patch | ||
BuildRequires: golang | ||
Requires: %{name}-acmesolver | ||
Requires: %{name}-cainjector | ||
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@@ -57,7 +58,7 @@ Summary: cert-manager's webhook binary | |
Webhook component providing API validation, mutation and conversion functionality for cert-manager. | ||
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%prep | ||
%setup -q -a 1 | ||
%autosetup -a 1 -p1 | ||
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%build | ||
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@@ -103,6 +104,9 @@ install -D -m0755 bin/webhook %{buildroot}%{_bindir}/ | |
%{_bindir}/webhook | ||
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%changelog | ||
* Wed Jan 08 2025 Muhammad Falak <[email protected]> - 1.12.13-2 | ||
- Patch CVE-2024-45337 | ||
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* Mon Sep 16 2024 Jiri Appl <[email protected]> - 1.12.13-1 | ||
- Upgrade to 1.12.13 which carries helm 3.14.2 to fix CVE-2024-26147 and CVE-2024-25620 | ||
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