de98f4ed55
* gnu/packages/crypto.scm (crypto++): New variable. * gnu/packages/patches/crypto++-fix-dos-in-asn.1-decoders.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. Co-authored-by: Ricardo Wurmus <rekado@elephly.net>
65 lines
1.8 KiB
Diff
65 lines
1.8 KiB
Diff
From 3d9181d7bdd8e491f745dbc9e34bd20b6f6da069 Mon Sep 17 00:00:00 2001
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From: Gergely Nagy <ngg@tresorit.com>
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Date: Wed, 14 Dec 2016 13:19:01 +0100
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Subject: [PATCH] Fix possible DoS in ASN.1 decoders (CVE-2016-9939)
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---
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asn.cpp | 10 ++++++++++
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asn.h | 2 ++
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2 files changed, 12 insertions(+)
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diff --git a/asn.cpp b/asn.cpp
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index 297ff010..2e923ef7 100644
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--- a/asn.cpp
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+++ b/asn.cpp
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@@ -123,6 +123,8 @@ size_t BERDecodeOctetString(BufferedTransformation &bt, SecByteBlock &str)
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size_t bc;
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if (!BERLengthDecode(bt, bc))
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BERDecodeError();
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+ if (bc > bt.MaxRetrievable())
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+ BERDecodeError();
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str.New(bc);
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if (bc != bt.Get(str, bc))
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@@ -139,6 +141,8 @@ size_t BERDecodeOctetString(BufferedTransformation &bt, BufferedTransformation &
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size_t bc;
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if (!BERLengthDecode(bt, bc))
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BERDecodeError();
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+ if (bc > bt.MaxRetrievable())
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+ BERDecodeError();
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bt.TransferTo(str, bc);
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return bc;
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@@ -161,6 +165,8 @@ size_t BERDecodeTextString(BufferedTransformation &bt, std::string &str, byte as
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size_t bc;
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if (!BERLengthDecode(bt, bc))
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BERDecodeError();
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+ if (bc > bt.MaxRetrievable())
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+ BERDecodeError();
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SecByteBlock temp(bc);
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if (bc != bt.Get(temp, bc))
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@@ -188,6 +194,10 @@ size_t BERDecodeBitString(BufferedTransformation &bt, SecByteBlock &str, unsigne
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size_t bc;
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if (!BERLengthDecode(bt, bc))
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BERDecodeError();
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+ if (bc == 0)
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+ BERDecodeError();
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+ if (bc > bt.MaxRetrievable())
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+ BERDecodeError();
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byte unused;
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if (!bt.Get(unused))
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diff --git a/asn.h b/asn.h
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index ed9de52c..33f0dd09 100644
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--- a/asn.h
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+++ b/asn.h
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@@ -498,6 +498,8 @@ void BERDecodeUnsigned(BufferedTransformation &in, T &w, byte asnTag = INTEGER,
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bool definite = BERLengthDecode(in, bc);
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if (!definite)
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BERDecodeError();
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+ if (bc > in.MaxRetrievable())
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+ BERDecodeError();
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SecByteBlock buf(bc);
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