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exiv2: Fix CVE-2021-29470

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References
      https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29470

      The out-of-bounds read is triggered when Exiv2 is used to write metadata into a crafted image file.
      An attacker could potentially exploit the vulnerability to cause a denial of service by crashing Exiv2,
      if they can trick the victim into running Exiv2 on a crafted image file.

      Upstream-Status: Accepted [6628a69c03]
      CVE: CVE-2021-29470

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
This commit is contained in:
wangmy 2021-05-18 16:07:59 +08:00 committed by Khem Raj
parent 8c9470bdfa
commit bb1400efda
2 changed files with 33 additions and 0 deletions
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32
meta-oe/recipes-support/exiv2/exiv2/CVE-2021-29470.patch Normal file
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@ -0,0 +1,32 @@
From 6628a69c036df2aa036290e6cd71767c159c79ed Mon Sep 17 00:00:00 2001
From: Kevin Backhouse <kevinbackhouse@github.com>
Date: Wed, 21 Apr 2021 12:06:04 +0100
Subject: [PATCH] Add more bounds checks in Jp2Image::encodeJp2Header
---
src/jp2image.cpp | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/jp2image.cpp b/src/jp2image.cpp
index b424225..349a9f0 100644
--- a/src/jp2image.cpp
+++ b/src/jp2image.cpp
@@ -645,13 +645,16 @@ static void boxes_check(size_t b,size_t m)
DataBuf output(boxBuf.size_ + iccProfile_.size_ + 100); // allocate sufficient space
long outlen = sizeof(Jp2BoxHeader) ; // now many bytes have we written to output?
long inlen = sizeof(Jp2BoxHeader) ; // how many bytes have we read from boxBuf?
+ enforce(sizeof(Jp2BoxHeader) <= static_cast<size_t>(output.size_), Exiv2::kerCorruptedMetadata);
Jp2BoxHeader* pBox = (Jp2BoxHeader*) boxBuf.pData_;
uint32_t length = getLong((byte*)&pBox->length, bigEndian);
+ enforce(length <= static_cast<size_t>(output.size_), Exiv2::kerCorruptedMetadata);
uint32_t count = sizeof (Jp2BoxHeader);
char* p = (char*) boxBuf.pData_;
bool bWroteColor = false ;
while ( count < length || !bWroteColor ) {
+ enforce(sizeof(Jp2BoxHeader) <= length - count, Exiv2::kerCorruptedMetadata);
Jp2BoxHeader* pSubBox = (Jp2BoxHeader*) (p+count) ;
// copy data. pointer could be into a memory mapped file which we will decode!
--
2.25.1

1
meta-oe/recipes-support/exiv2/exiv2_0.27.3.bb
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@ -14,6 +14,7 @@ SRC_URI += "file://0001-Use-compiler-fcf-protection-only-if-compiler-arch-su.pat
file://CVE-2021-29458.patch \
file://CVE-2021-29463.patch \
file://CVE-2021-29464.patch \
file://CVE-2021-29470.patch \
file://CVE-2021-3482.patch"
S = "${WORKDIR}/${BPN}-${PV}-Source"