e016790fe1
- Security fixes and hardenings for boothole 3 / boothole 2022 (bsc#1198581) * 0001-video-Remove-trailing-whitespaces.patch * 0002-loader-efi-chainloader-Simplify-the-loader-state.patch * 0003-commands-boot-Add-API-to-pass-context-to-loader.patch - Fix CVE-2022-28736 (bsc#1198496) * 0004-loader-efi-chainloader-Use-grub_loader_set_ex.patch - Fix CVE-2022-28735 (bsc#1198495) * 0005-kern-efi-sb-Reject-non-kernel-files-in-the-shim_lock.patch * 0006-kern-file-Do-not-leak-device_name-on-error-in-grub_f.patch * 0007-video-readers-png-Abort-sooner-if-a-read-operation-f.patch * 0008-video-readers-png-Refuse-to-handle-multiple-image-he.patch - Fix CVE-2021-3695 (bsc#1191184) * 0009-video-readers-png-Drop-greyscale-support-to-fix-heap.patch - Fix CVE-2021-3696 (bsc#1191185) * 0010-video-readers-png-Avoid-heap-OOB-R-W-inserting-huff-.patch * 0011-video-readers-png-Sanity-check-some-huffman-codes.patch * 0012-video-readers-jpeg-Abort-sooner-if-a-read-operation-.patch * 0013-video-readers-jpeg-Do-not-reallocate-a-given-huff-ta.patch * 0014-video-readers-jpeg-Refuse-to-handle-multiple-start-o.patch - Fix CVE-2021-3697 (bsc#1191186) * 0015-video-readers-jpeg-Block-int-underflow-wild-pointer-.patch * 0016-normal-charset-Fix-array-out-of-bounds-formatting-un.patch - Fix CVE-2022-28733 (bsc#1198460) * 0017-net-ip-Do-IP-fragment-maths-safely.patch * 0018-net-netbuff-Block-overly-large-netbuff-allocs.patch * 0019-net-dns-Fix-double-free-addresses-on-corrupt-DNS-res.patch * 0020-net-dns-Don-t-read-past-the-end-of-the-string-we-re-.patch * 0021-net-tftp-Prevent-a-UAF-and-double-free-from-a-failed.patch * 0022-net-tftp-Avoid-a-trivial-UAF.patch * 0023-net-http-Do-not-tear-down-socket-if-it-s-already-bee.patch OBS-URL: https://build.opensuse.org/request/show/981228 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=416
49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
From d7374ab1a110a7ddcfa5a0eda9574ebef2220ee1 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 8 Mar 2022 18:17:03 +1100
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Subject: [PATCH 24/32] net/http: Fix OOB write for split http headers
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GRUB has special code for handling an http header that is split
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across two packets.
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The code tracks the end of line by looking for a "\n" byte. The
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code for split headers has always advanced the pointer just past the
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end of the line, whereas the code that handles unsplit headers does
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not advance the pointer. This extra advance causes the length to be
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one greater, which breaks an assumption in parse_line(), leading to
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it writing a NUL byte one byte past the end of the buffer where we
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reconstruct the line from the two packets.
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It's conceivable that an attacker controlled set of packets could
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cause this to zero out the first byte of the "next" pointer of the
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grub_mm_region structure following the current_line buffer.
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Do not advance the pointer in the split header case.
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Fixes: CVE-2022-28734
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/net/http.c | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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diff --git a/grub-core/net/http.c b/grub-core/net/http.c
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index a77bc4e4b8..d9d2ade98e 100644
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--- a/grub-core/net/http.c
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+++ b/grub-core/net/http.c
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@@ -193,9 +193,7 @@ http_receive (grub_net_tcp_socket_t sock __attribute__ ((unused)),
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int have_line = 1;
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char *t;
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ptr = grub_memchr (nb->data, '\n', nb->tail - nb->data);
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- if (ptr)
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- ptr++;
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- else
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+ if (ptr == NULL)
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{
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have_line = 0;
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ptr = (char *) nb->tail;
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--
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2.34.1
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