59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
From 2858029a5dbdd3fab73b1884e296daa3f3f0b1a1 Mon Sep 17 00:00:00 2001
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From: Mauro Matteo Cascella <mcascell@redhat.com>
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Date: Tue, 4 Jul 2023 10:41:22 +0200
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Subject: [PATCH] ui/vnc-clipboard: fix infinite loop in inflate_buffer
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(CVE-2023-3255)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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A wrong exit condition may lead to an infinite loop when inflating a
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valid zlib buffer containing some extra bytes in the `inflate_buffer`
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function. The bug only occurs post-authentication. Return the buffer
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immediately if the end of the compressed data has been reached
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(Z_STREAM_END).
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Fixes: CVE-2023-3255
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Fixes: 0bf41cab ("ui/vnc: clipboard support")
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Reported-by: Kevin Denis <kevin.denis@synacktiv.com>
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Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Tested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-ID: <20230704084210.101822-1-mcascell@redhat.com>
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---
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ui/vnc-clipboard.c | 10 ++++------
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1 file changed, 4 insertions(+), 6 deletions(-)
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diff --git a/ui/vnc-clipboard.c b/ui/vnc-clipboard.c
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index 67284b556c..c84599cfdb 100644
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--- a/ui/vnc-clipboard.c
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+++ b/ui/vnc-clipboard.c
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@@ -51,8 +51,11 @@ static uint8_t *inflate_buffer(uint8_t *in, uint32_t in_len, uint32_t *size)
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ret = inflate(&stream, Z_FINISH);
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switch (ret) {
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case Z_OK:
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- case Z_STREAM_END:
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break;
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+ case Z_STREAM_END:
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+ *size = stream.total_out;
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+ inflateEnd(&stream);
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+ return out;
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case Z_BUF_ERROR:
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out_len <<= 1;
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if (out_len > (1 << 20)) {
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@@ -67,11 +70,6 @@ static uint8_t *inflate_buffer(uint8_t *in, uint32_t in_len, uint32_t *size)
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}
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}
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- *size = stream.total_out;
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- inflateEnd(&stream);
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-
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- return out;
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-
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err_end:
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inflateEnd(&stream);
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err:
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--
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2.41.0.windows.1
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