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104 lines
3.7 KiB
104 lines
3.7 KiB
2 years ago
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From 22d779d5982dc82d629710d41973ed6545707bd9 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Tue, 28 Jun 2022 13:54:16 +0200
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Subject: [PATCH] docs/guestfs-security: document CVE-2022-2211
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Short log for the common submodule, commit range
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f8de5508fe75..35467027f657:
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Laszlo Ersek (2):
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mlcustomize: factor out pkg install/update/uninstall from guestfs-tools
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options: fix buffer overflow in get_keys() [CVE-2022-2211]
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2100862
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Message-Id: <20220628115418.5376-2-lersek@redhat.com>
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Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
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Cherry picked from commit 99844660b48ed809e37378262c65d63df6ce4a53.
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For the cherry pick I only added one submodule commit:
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options: fix buffer overflow in get_keys() [CVE-2022-2211]
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---
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common | 2 +-
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docs/guestfs-security.pod | 28 ++++++++++++++++++++++++++++
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2 files changed, 29 insertions(+), 1 deletion(-)
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Submodule common be09523d6..1174b443a:
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diff --git a/common/options/keys.c b/common/options/keys.c
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index 798315c..d27a712 100644
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--- a/common/options/keys.c
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+++ b/common/options/keys.c
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@@ -128,17 +128,23 @@ read_first_line_from_file (const char *filename)
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char **
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get_keys (struct key_store *ks, const char *device, const char *uuid)
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{
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- size_t i, j, len;
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+ size_t i, j, nmemb;
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char **r;
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char *s;
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/* We know the returned list must have at least one element and not
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* more than ks->nr_keys.
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*/
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- len = 1;
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- if (ks)
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- len = MIN (1, ks->nr_keys);
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- r = calloc (len+1, sizeof (char *));
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+ nmemb = 1;
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+ if (ks && ks->nr_keys > nmemb)
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+ nmemb = ks->nr_keys;
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+
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+ /* make room for the terminating NULL */
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+ if (nmemb == (size_t)-1)
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+ error (EXIT_FAILURE, 0, _("size_t overflow"));
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+ nmemb++;
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+
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+ r = calloc (nmemb, sizeof (char *));
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if (r == NULL)
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error (EXIT_FAILURE, errno, "calloc");
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diff --git a/docs/guestfs-security.pod b/docs/guestfs-security.pod
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index 9ceef5623..efa35b29d 100644
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--- a/docs/guestfs-security.pod
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+++ b/docs/guestfs-security.pod
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@@ -406,6 +406,34 @@ The libvirt backend is not affected.
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The solution is to update qemu to a version containing the fix (see
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L<https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg01012.html>).
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+=head2 CVE-2022-2211
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+
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+L<https://bugzilla.redhat.com/CVE-2022-2211>
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+
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+The C<get_keys> function in F<libguestfs-common/options/keys.c> collects
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+those I<--key> options from the command line into a new array that match
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+a particular block device that's being decrypted for inspection. The
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+function intends to size the result array such that potentially all
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+I<--key> options, plus a terminating C<NULL> element, fit into it. The
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+code mistakenly uses the C<MIN> macro instead of C<MAX>, and therefore
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+only one element is allocated before the C<NULL> terminator.
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+
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+Passing precisely two I<--key ID:...> options on the command line for
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+the encrypted block device C<ID> causes C<get_keys> to overwrite the
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+terminating C<NULL>, leading to an out-of-bounds read in
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+C<decrypt_mountables>, file F<libguestfs-common/options/decrypt.c>.
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+
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+Passing more than two I<--key ID:...> options on the command line for
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+the encrypted block device C<ID> causes C<get_keys> itself to perform
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+out-of-bounds writes. The most common symptom is a crash with C<SIGSEGV>
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+later on.
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+
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+This issue affects -- broadly speaking -- all libguestfs-based utilities
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+that accept I<--key>, namely: C<guestfish>, C<guestmount>, C<virt-cat>,
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+C<virt-customize>, C<virt-diff>, C<virt-edit>, C<virt-get-kernel>,
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+C<virt-inspector>, C<virt-log>, C<virt-ls>, C<virt-sparsify>,
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+C<virt-sysprep>, C<virt-tail>, C<virt-v2v>.
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+
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=head1 SEE ALSO
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L<guestfs(3)>,
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--
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2.31.1
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