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From 324dbb4c27ae789c73b69dbf4611242267919dd4 Mon Sep 17 00:00:00 2001
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From: Stefan Berger <stefanb@linux.ibm.com>
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Date: Mon, 20 Feb 2023 14:41:10 -0500
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Subject: [PATCH] tpm2: Check size of buffer before accessing it (CVE-2023-1017
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& -1018)
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Check that there are sufficient bytes in the buffer before reading the
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cipherSize from it. Also, reduce the bufferSize variable by the number
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of bytes that make up the cipherSize to avoid reading and writing bytes
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beyond the buffer in subsequent steps that do in-place decryption.
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This fixes CVE-2023-1017 & CVE-2023-1018.
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Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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---
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src/tpm2/CryptUtil.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/src/tpm2/CryptUtil.c b/src/tpm2/CryptUtil.c
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index 002fde0..8fae5b6 100644
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--- a/src/tpm2/CryptUtil.c
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+++ b/src/tpm2/CryptUtil.c
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@@ -830,6 +830,10 @@ CryptParameterDecryption(
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+ sizeof(session->sessionKey.t.buffer)));
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TPM2B_HMAC_KEY key; // decryption key
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UINT32 cipherSize = 0; // size of cipher text
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+
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+ if (leadingSizeInByte > bufferSize)
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+ return TPM_RC_INSUFFICIENT;
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+
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// Retrieve encrypted data size.
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if(leadingSizeInByte == 2)
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{
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@@ -837,6 +841,7 @@ CryptParameterDecryption(
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// data to be decrypted
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cipherSize = (UINT32)BYTE_ARRAY_TO_UINT16(buffer);
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buffer = &buffer[2]; // advance the buffer
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+ bufferSize -= 2;
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}
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#ifdef TPM4B
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else if(leadingSizeInByte == 4)
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@@ -844,6 +849,7 @@ CryptParameterDecryption(
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// the leading size is four bytes so get the four byte size field
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cipherSize = BYTE_ARRAY_TO_UINT32(buffer);
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buffer = &buffer[4]; //advance pointer
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+ bufferSize -= 4;
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}
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#endif
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else
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--
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2.39.2
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