44f318a38d
Porting patches from grub2_2.06-3~deb11u1 to fix below CVEs: CVE-2021-3695 CVE-2021-3696 CVE-2021-3697 CVE-2022-28733 CVE-2022-28734 The source code of grub2_2.06-3~deb11u1 is from: https://snapshot.debian.org/archive/debian/20220807T030023Z/pool /main/g/grub2/grub2_2.06-3~deb11u1.debian.tar.xz The relationship between commits and CVEs is as below: (1)CVE-2021-3695 commit <video/readers/png: Drop greyscale support to fix heap out-of-bounds write> (2)CVE-2021-3696 commit <video/readers/png: Avoid heap OOB R/W inserting huff table items> (3)CVE-2021-3697 commit <video/readers/jpeg: Block int underflow -> wild pointer write> (4)CVE-2022-28733 commit <net/ip: Do IP fragment maths safely> (5)CVE-2022-28734 commit <net/http: Fix OOB write for split http headers> commit <net/http: Error out on headers with LF without CR> Test plan: - PASS: build grub2/grub-efi. - PASS: build-image and install and boot up on lab/qemu. - PASS: check that the "stx.N" version number is right for both bios(grub2 ver) and uefi(grub-efi ver) boot. Partial-Bug: #2034119 Signed-off-by: Li Zhou <li.zhou@windriver.com> Change-Id: Ia27b1ee225f13e9c4ad08a0828f93ea37f8d3dfb
51 lines
1.5 KiB
Diff
51 lines
1.5 KiB
Diff
From c96929e9eea455b07e0c2e06bc401eea6bf2be11 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 19:04:40 +1100
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Subject: [PATCH 6/6] net/http: Error out on headers with LF without CR
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In a similar vein to the previous patch, parse_line() would write
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a NUL byte past the end of the buffer if there was an HTTP header
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with a LF rather than a CRLF.
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RFC-2616 says:
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Many HTTP/1.1 header field values consist of words separated by LWS
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or special characters. These special characters MUST be in a quoted
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string to be used within a parameter value (as defined in section 3.6).
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We don't support quoted sections or continuation lines, etc.
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If we see an LF that's not part of a CRLF, bail out.
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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 | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/grub-core/net/http.c b/grub-core/net/http.c
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index a19b0a2..1fa62b5 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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@@ -68,7 +68,15 @@ parse_line (grub_file_t file, http_data_t data, char *ptr, grub_size_t len)
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char *end = ptr + len;
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while (end > ptr && *(end - 1) == '\r')
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end--;
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+
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+ /* LF without CR. */
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+ if (end == ptr + len)
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+ {
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+ data->errmsg = grub_strdup (_("invalid HTTP header - LF without CR"));
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+ return GRUB_ERR_NONE;
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+ }
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*end = 0;
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+
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/* Trailing CRLF. */
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if (data->in_chunk_len == 1)
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{
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--
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2.17.1
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