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安全漏洞
OpenCA多个签名验证漏洞
发布日期：2003-11-28
更新日期：2003-12-03
受影响系统：
OpenCA OpenCA 0.9.1-3不受影响系统：
OpenCA OpenCA 0.9.1-2
OpenCA OpenCA 0.9.1-1
OpenCA OpenCA 0.9.1
OpenCA OpenCA 0.9.0-2
OpenCA OpenCA 0.9.0-1
OpenCA OpenCA 0.9.0
OpenCA OpenCA 0.8.6
OpenCA OpenCA 0.8.1
OpenCA OpenCA 0.8.0
OpenCA OpenCA 0.9.1-4描述：
BUGTRAQ ID: 9123
CVE(CAN) ID: CVE-2003-0960
OpenCA是一款提供PKI架构和相关项目开发的项目实现。
OpenCA存在多个漏洞，可导致修改的或过期的证书被接受。
具体问题如下：
1、OpenCA有一个通用加密操作的库-crypto-utils.lib，这个库包含一个函数判断用于建立PKCS#7签名的证书序列，函数使用这个序列装载和返回证书。不过这个函数错误的使用OpenCA::PKCS7接口。
2、加密库crypto-utils.lib使用所有包含签名的证书来建议签名者证书的X.509对象，结果是来自证书链之一的证书建立的对象可以是任意的。
3、OpenCA::PKCS7包含一个错误规则表达式用于判断证书链的解析。
4、在OpenCA::PKCS7中证书链中的序列被错误的规则表达式解析，一些大写字符如A，C，B，D，E和F会被忽略。
<*来源：OpenCA Security Advisory
链接：http://www.openca.org/news/CAN-2003-0960.txt
*>
建议：
临时解决方法：
如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：
--- openca-0.9.1.3/src/modules/openca-pkcs7/PKCS7.pm 2002-09-10 16:42:02.000000000 +0200
+++ openca-0.9.1.4/src/modules/openca-pkcs7/PKCS7.pm 2003-11-26 15:54:08.000000000 +0100
@@ -69,7 +69,7 @@
our ($errno, $errval);
-($OpenCA::PKCS7::VERSION = '$Revision: 1.12 $' )=~ s/(?:^.*: (\d+))|(?:\s+\$$)/defined $1?"0\.9":""/eg;
+($OpenCA::PKCS7::VERSION = '$Revision: 1.12.2.1 $' )=~ s/(?:^.*: (\d+))|(?:\s+\$$)/defined $1?"0\.9":""/eg;
my %params = (
inFile => undef,
@@ -167,6 +167,8 @@
my ( $ret, $tmp );
+ return $self->{parsed} if ($self->{parsed});
+
$tmp = $self->{backend}->verify( SIGNATURE=>$self->{signature},
DATA_FILE=>$self->{dataFile},
CA_CERT=>$self->{caCert},
@@ -292,10 +294,10 @@
($self->{status}) = ( $line =~ /^\s*error:([^:]*):/ );
}
- next if( $line != /^depth/i );
+ next if( $line !~ /^depth/i );
( $currentDepth, $serial, $dn ) =
- ( $line =~ /depth:([\d]+) serial:([a-f\d]+) subject:(.*)/ );
+ ( $line =~ /depth:([\d]+) serial:([a-fA-F\d]+) subject:(.*)/ );
$ret->{$currentDepth}->{SERIAL} = hex ($serial) ;
$ret->{$currentDepth}->{DN} = $dn;
--- openca-0.9.1.3/src/common/lib/functions/crypto-utils.lib 2002-12-22 13:08:19.000000000 +0100
+++ openca-0.9.1.4/src/common/lib/functions/crypto-utils.lib 2003-11-26 13:04:50.000000000 +0100
@@ -176,19 +176,36 @@
return undef;
}
- ## Get signer certificate from the pkcs7 structure
- $sigCert = new OpenCA::X509 ( SHELL => $cryptoShell,
- DATA => $sig->getSigner()->{CERTIFICATE});
-
- if( not $sigCert ) {
- $errno = 6103;
- $errval = i18nGettext ("Signer's certificate is corrupt!\nOpenCA::X509 returns errorcode __ERRNO__ (__ERRVAL__).",
- "__ERRNO__", $OpenCA::X509::errno,
- "__ERRVAL__", $OpenCA::X509::errval);
- return undef;
+ ## Get signer certificate chain from the pkcs7 structure
+ my @chain = split /-----END CERTIFICATE-----/,
+ $sig->getSigner()->{CERTIFICATE};
+ for (my $i=0; $i < scalar @chain; $i++)
+ {
+ if (not $chain[$i])
+ {
+ delete $chain[$i];
+ next;
+ }
+ $chain[$i] .= "-----END CERTIFICATE-----";
+ $chain[$i] =~ s/^.*-----BEGIN CERTIFICATE-----/-----BEGIN CERTIFICATE-----/s;
+ }
+ $sigCert = undef;
+ for (my $i=0; $i < scalar @chain; $i++)
+ {
+ $sigCert = new OpenCA::X509 ( SHELL => $cryptoShell,
+ DATA => $chain[$i]);
+ if( not $sigCert ) {
+ $errno = 6103;
+ $errval = i18nGettext ("Signer's certificate is corrupt!\nOpenCA::X509 returns errorcode __ERRNO__ (__ERRVAL__).",
+ "__ERRNO__", $OpenCA::X509::errno,
+ "__ERRVAL__", $OpenCA::X509::errval);
+ return undef;
+ }
+ last if ( $tmpCert->getSerial() eq $sigCert->getSerial() );
+ $sigCert = undef;
}
- if( $tmpCert->getSerial() ne $sigCert->getSerial() ) {
+ if( not $sigCert ) {
$errno = 6104;
$errval = gettext ("Signer's Certificate and DB's Certificate do not match");
return undef;
@@ -281,19 +298,8 @@
return undef;
}
- my $sigCert = new OpenCA::X509 ( SHELL => $cryptoShell,
- DATA => $sig->getSigner()->{CERTIFICATE});
-
- if (not $sigCert) {
- $errno = 6302;
- $errval = i18nGettext ("Cannot create X509-object from the certificate of the signer! OpenCA::X509 returns errorcode __ERRNO__ (__ERRVAL__).",
- "__ERRNO__", $OpenCA::X509::errno,
- "__ERRVAL__", $OpenCA::X509::errval);
- return undef;
- }
-
my $db_cert = $db->getItem( DATATYPE => 'CERTIFICATE',
- KEY => $sigCert->getSerial() );
+ KEY => $sig->getSigner()->{SERIAL} );
if( not $db_cert ) {
$errno = 6303;
--- openca-0.9.1.3/src/common/lib/cmds/verifySignature 2003-03-31 15:45:19.000000000 +0200
+++ openca-0.9.1.4/src/common/lib/cmds/verifySignature 2003-11-26 13:04:34.000000000 +0100
@@ -11,7 +11,7 @@
## Get the Configuration parameters ...
my ( $parsed, $lnk, $serLink, $sigInfo, $sigStatus, $signer, $signature);
my ( $baseDoc, $info, $sigCertStatus, $def, $dbStatus, $dbMessage);
-my ( $myCN, $myEmail, $mySerial, @sigCert, $tmpCert, $pCert );
+my ( $myCN, $myEmail, $mySerial, $tmpCert, $pCert );
## Get Required Parameters from Configuration
my $baseDoc = getRequired ('verifySignatureform');
@@ -53,10 +53,7 @@
$myDN = $signer->{DN};
$myDN =~ s/^\///; $myDN =~ s/\//<BR>/g;
-$sigCert = new OpenCA::X509 ( SHELL => $cryptoShell,
- DATA => $sign->getSigner()->{CERTIFICATE});
-
-$issuerDN = $sigCert->getParsed()->{ISSUER};
+$issuerDN = $sign->getParsed()->{CHAIN}->{1}->{DN};
$issuerDN =~ s/^\///; $issuerDN =~ s/[\/\,]/<BR>/g;
## Check Signature Status
@@ -71,7 +68,7 @@
$dbStatus = $errno;
$sigStatus = "<FONT COLOR=\"Red\">".gettext("Unknown")."</FONT>";
- $serLink = $sigCert->getSerial();
+ $serLink = $sign->getSigner()->{SERIAL};
} else {
$sigMessage = gettext("Signature correctly verified");
}
@@ -96,11 +93,7 @@
$serLink = $tmpCert->getSerial();
}
-if( $sigCert ) {
- $pCert = $sigCert->getParsed();
-} elsif ( $tmpCert ) {
- $pCert = $tmpCert->getParsed();
-}
+$pCert = $tmpCert->getParsed();
## View the Operator Used Certificate Data
$page = $query->subVar( $page, '@DN@', ($myDN or "n/a" ) );
--- openca-0.9.1.3/src/common/lib/cmds/viewSignature 2002-12-10 16:18:15.000000000 +0100
+++ openca-0.9.1.4/src/common/lib/cmds/viewSignature 2003-11-26 13:04:34.000000000 +0100
@@ -11,7 +11,7 @@
## Get the Configuration parameters ...
my ( $parsed, $lnk, $serLink, $sigInfo, $sigStatus, $signer, $signature);
my ( $baseDoc, $info, $sigCertStatus, $def, $dbStatus, $dbMessage);
-my ( $myCN, $myEmail, $mySerial, @sigCert, $tmpCert, $pCert );
+my ( $myCN, $myEmail, $mySerial, $tmpCert, $pCert );
my $dataType = $query->param('dataType' );
my $key = $query->param('key');
@@ -54,9 +54,6 @@
name=>"EMAIL", value=>$signer->{DN_HASH}->{EMAILADDRESS}[0]} );
$myEmail = $lnk->a({-href=>$lnk->self_url()}, $signer->{DN_HASH}->{EMAILADDRESS}[0]);
-$sigCert = new OpenCA::X509 ( SHELL => $cryptoShell,
- DATA => $signature->getSigner()->{CERTIFICATE});
-
## Check Signature Status
if( not libCheckSignature( SIGNATURE=>$signature ) ) {
$sigStatus = "<FONT COLOR=\"Red\">".gettext("Error")."</FONT>";
@@ -105,7 +102,7 @@
$serLink = $lnk->a({-href=>$lnk->self_url()},
$tmpCert->getSerial() );
- $decSerLink = "( " . hex( $sigCert->getSerial() ) . " )";
+ $decSerLink = "( " . hex( $tmpCert->getSerial() ) . " )";
$lnk = new CGI({cmd => "search",
dataType => "CERTIFICATE",
@@ -114,11 +111,7 @@
$myEmail = $lnk->a({-href=>$lnk->self_url()}, $tmpCert->getParsed()->{EMAILADDRESS});
}
-if( $sigCert ) {
- $pCert = $sigCert->getParsed();
-} elsif ( $tmpCert ) {
- $pCert = $tmpCert->getParsed();
-}
+$pCert = $tmpCert->getParsed();
## View the Operator Used Certificate Data
$page = $query->subVar( $page, '@CN@', ($myCN or "n/a" ) );
厂商补丁：
OpenCA
------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
OpenCA Upgrade openca-0.9.1-4.tar.gz
http://www.openca.org/cgi-bin/openca/downloads/sf-dl?name=openca-0.9.1-4.tar.gz
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