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From 0000000000000000000000000000000000000000 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] 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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(cherry picked from commit d232ad41ac4979a9de4d746e5fdff9caf0e303de)
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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 58546739a2..57d2721719 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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@@ -69,7 +69,15 @@ 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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