diff options
Diffstat (limited to 'poky/meta/recipes-devtools/apt/apt/CVE-2020-3810.patch')
| -rw-r--r-- | poky/meta/recipes-devtools/apt/apt/CVE-2020-3810.patch | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/poky/meta/recipes-devtools/apt/apt/CVE-2020-3810.patch b/poky/meta/recipes-devtools/apt/apt/CVE-2020-3810.patch new file mode 100644 index 0000000000..cf1206a3fa --- /dev/null +++ b/poky/meta/recipes-devtools/apt/apt/CVE-2020-3810.patch @@ -0,0 +1,174 @@ +From dceb1e49e4b8e4dadaf056be34088b415939cda6 Mon Sep 17 00:00:00 2001 +From: Julian Andres Klode <julian.klode@canonical.com> +Date: Tue, 12 May 2020 11:49:09 +0200 +Subject: [PATCH] SECURITY UPDATE: Fix out of bounds read in .ar and .tar + implementation (CVE-2020-3810) + +When normalizing ar member names by removing trailing whitespace +and slashes, an out-out-bound read can be caused if the ar member +name consists only of such characters, because the code did not +stop at 0, but would wrap around and continue reading from the +stack, without any limit. + +Add a check to abort if we reached the first character in the +name, effectively rejecting the use of names consisting just +of slashes and spaces. + +Furthermore, certain error cases in arfile.cc and extracttar.cc have +included member names in the output that were not checked at all and +might hence not be nul terminated, leading to further out of bound reads. + +Fixes Debian/apt#111 +LP: #1878177 + +CVE: CVE-2020-3810 + +Upstream-Status: Backport: +https://salsa.debian.org/apt-team/apt/-/commit/dceb1e49e4b8e4dadaf056be34088b415939cda6 + +Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com> +--- +apt-inst/contrib/arfile.cc | 11 ++- +apt-inst/contrib/extracttar.cc | 2 +- +.../test-github-111-invalid-armember | 88 +++++++++++++++++++ + 3 files changed, 98 insertions(+), 3 deletions(-) + create mode 100755 test/integration/test-github-111-invalid-armember + +diff --git a/apt-inst/contrib/arfile.cc b/st/contrib/arfile.cc +index 3fc3afedb..5cb43c690 100644 +--- a/apt-inst/contrib/arfile.cc ++++ b/apt-inst/contrib/arfile.cc +@@ -92,7 +92,7 @@ bool ARArchive::LoadHeaders() + StrToNum(Head.Size,Memb->Size,sizeof(Head.Size)) == false) + { + delete Memb; +- return _error->Error(_("Invalid archive member header %s"), Head.Name); ++ return _error->Error(_("Invalid archive member header")); + } + + // Check for an extra long name string +@@ -119,7 +119,14 @@ bool ARArchive::LoadHeaders() + else + { + unsigned int I = sizeof(Head.Name) - 1; +- for (; Head.Name[I] == ' ' || Head.Name[I] == '/'; I--); ++ for (; Head.Name[I] == ' ' || Head.Name[I] == '/'; I--) ++ { ++ if (I == 0) ++ { ++ delete Memb; ++ return _error->Error(_("Invalid archive member header")); ++ } ++ } + Memb->Name = std::string(Head.Name,I+1); + } + +diff --git a/apt-inst/contrib/extracttar.cc b/apt-inst/contrib/extracttar.cc +index 9bb0a55c0..b22f59dbc 100644 +--- a/apt-inst/contrib/extracttar.cc ++++ b/apt-inst/contrib/extracttar.cc +@@ -254,7 +254,7 @@ bool ExtractTar::Go(pkgDirStream &Stream) + + default: + BadRecord = true; +- _error->Warning(_("Unknown TAR header type %u, member %s"),(unsigned)Tar->LinkFlag,Tar->Name); ++ _error->Warning(_("Unknown TAR header type %u"), (unsigned)Tar->LinkFlag); + break; + } + +diff --git a/test/integration/test-github-111-invalid-armember b/test/integration/test-github-111-invalid-armember +new file mode 100755 +index 000000000..ec2163bf6 +--- /dev/null ++++ b/test/integration/test-github-111-invalid-armember +@@ -0,0 +1,88 @@ ++#!/bin/sh ++set -e ++ ++TESTDIR="$(readlink -f "$(dirname "$0")")" ++. "$TESTDIR/framework" ++setupenvironment ++configarchitecture "amd64" ++setupaptarchive ++ ++# this used to crash, but it should treat it as an invalid member header ++touch ' ' ++ar -q test.deb ' ' ++testsuccessequal "E: Invalid archive member header" ${BUILDDIRECTORY}/../test/interactive-helper/testdeb test.deb ++ ++ ++rm test.deb ++touch 'x' ++ar -q test.deb 'x' ++testsuccessequal "E: This is not a valid DEB archive, missing 'debian-binary' member" ${BUILDDIRECTORY}/../test/interactive-helper/testdeb test.deb ++ ++ ++# <name><size> [ other fields] - name is not nul terminated here, it ends in . ++msgmsg "Unterminated ar member name" ++printf '!<arch>\0120123456789ABCDE.A123456789A.01234.01234.0123456.012345678.0.' > test.deb ++testsuccessequal "E: Invalid archive member header" ${BUILDDIRECTORY}/../test/interactive-helper/testdeb test.deb ++ ++ ++# unused source code for generating $tar below ++maketar() { ++ cat > maketar.c << EOF ++ #include <stdio.h> ++ #include <string.h> ++ struct tar { ++ char Name[100]; ++ char Mode[8]; ++ char UserID[8]; ++ char GroupID[8]; ++ char Size[12]; ++ char MTime[12]; ++ char Checksum[8]; ++ char LinkFlag; ++ char LinkName[100]; ++ char MagicNumber[8]; ++ char UserName[32]; ++ char GroupName[32]; ++ char Major[8]; ++ char Minor[8]; ++ }; ++ ++ int main(void) ++ { ++ union { ++ struct tar t; ++ char buf[512]; ++ } t; ++ for (int i = 0; i < sizeof(t.buf); i++) ++ t.buf[i] = '7'; ++ memcpy(t.t.Name, "unterminatedName", 16); ++ memcpy(t.t.UserName, "userName", 8); ++ memcpy(t.t.GroupName, "thisIsAGroupNamethisIsAGroupName", 32); ++ t.t.LinkFlag = 'X'; // I AM BROKEN ++ memcpy(t.t.Size, "000000000000", sizeof(t.t.Size)); ++ memset(t.t.Checksum,' ',sizeof(t.t.Checksum)); ++ ++ unsigned long sum = 0; ++ for (int i = 0; i < sizeof(t.buf); i++) ++ sum += t.buf[i]; ++ ++ int written = sprintf(t.t.Checksum, "%lo", sum); ++ for (int i = written; i < sizeof(t.t.Checksum); i++) ++ t.t.Checksum[i] = ' '; ++ fwrite(t.buf, sizeof(t.buf), 1, stdout); ++ } ++EOF ++ ++ gcc maketar.c -o maketar -Wall ++ ./maketar ++} ++ ++ ++# ++tar="unterminatedName77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777700000000000077777777777773544 X777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777userName777777777777777777777777thisIsAGroupNamethisIsAGroupName777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777" ++printf '%s' "$tar" | gzip > control.tar.gz ++cp control.tar.gz data.tar.gz ++touch debian-binary ++rm test.deb ++ar -q test.deb debian-binary control.tar.gz data.tar.gz ++testsuccessequal "W: Unknown TAR header type 88" ${BUILDDIRECTORY}/../test/interactive-helper/testdeb test.deb +-- +GitLab |