Add SA-15:11.bind.
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Xin LI
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svn2git
2020-12-08 03:00:23 +00:00
svn path=/head/; revision=46937
6 changed files with 226 additions and 0 deletions
137
share/security/advisories/FreeBSD-SA-15:11.bind.asc
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share/security/advisories/FreeBSD-SA-15:11.bind.asc
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-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-15:11.bind Security Advisory
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The FreeBSD Project
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Topic: BIND resolver remote denial of service when validating
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Category: contrib
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Module: bind
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Announced: 2015-07-07
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Credits: ISC
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Affects: FreeBSD 8.4 and FreeBSD 9.3.
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Corrected: 2015-07-07 21:43:23 UTC (stable/9, 9.3-STABLE)
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2015-07-07 21:44:01 UTC (releng/9.3, 9.3-RELEASE-p19)
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2015-07-07 21:43:23 UTC (stable/8, 8.4-STABLE)
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2015-07-07 21:44:01 UTC (releng/8.4, 8.4-RELEASE-p33)
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CVE Name: CVE-2015-4620
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:https://security.FreeBSD.org/>.
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I. Background
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BIND 9 is an implementation of the Domain Name System (DNS) protocol.
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The named(8) daemon is an Internet Domain Name Server. The libdns
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library is a library of DNS protocol support functions.
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II. Problem Description
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Due to a software defect, specially constructed zone data could cause
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named(8) to crash with an assertion failure and rejecting the malformed
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query when DNSSEC validation is enabled.
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III. Impact
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An attacker who can cause specific queries to be sent to a nameserver
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could cause named(8) to crash, resulting in a denial of service.
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IV. Workaround
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No workaround is available, but hosts not running named(8) are not
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vulnerable.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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2) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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3) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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[FreeBSD 9.3]
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# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-9.patch
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# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-9.patch.asc
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# gpg --verify bind-9.patch.asc
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[FreeBSD 8.4]
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# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-8.patch
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# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-8.patch.asc
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# gpg --verify bind-8.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile the operating system using buildworld and installworld as
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described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable daemons, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/8/ r285257
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releng/8.4/ r285258
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stable/9/ r285257
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releng/9.3/ r285258
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://kb.isc.org/article/AA-01267/>
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4620>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:11.bind.asc>
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21
share/security/patches/SA-15:11/bind-8.patch
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21
share/security/patches/SA-15:11/bind-8.patch
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@ -0,0 +1,21 @@
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Index: contrib/bind9/lib/dns/validator.c
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===================================================================
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--- contrib/bind9/lib/dns/validator.c (revision 284940)
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+++ contrib/bind9/lib/dns/validator.c (working copy)
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@@ -1406,7 +1406,6 @@ compute_keytag(dns_rdata_t *rdata, dns_rdata_dnske
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*/
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static isc_boolean_t
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isselfsigned(dns_validator_t *val) {
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- dns_fixedname_t fixed;
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dns_rdataset_t *rdataset, *sigrdataset;
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dns_rdata_t rdata = DNS_RDATA_INIT;
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dns_rdata_t sigrdata = DNS_RDATA_INIT;
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@@ -1461,7 +1460,7 @@ isselfsigned(dns_validator_t *val) {
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result = dns_dnssec_verify2(name, rdataset, dstkey,
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ISC_TRUE, mctx, &sigrdata,
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- dns_fixedname_name(&fixed));
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+ NULL);
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dst_key_free(&dstkey);
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if (result != ISC_R_SUCCESS)
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continue;
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17
share/security/patches/SA-15:11/bind-8.patch.asc
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17
share/security/patches/SA-15:11/bind-8.patch.asc
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22
share/security/patches/SA-15:11/bind-9.patch
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22
share/security/patches/SA-15:11/bind-9.patch
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@ -0,0 +1,22 @@
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Index: contrib/bind9/lib/dns/validator.c
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===================================================================
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--- contrib/bind9/lib/dns/validator.c (revision 284940)
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+++ contrib/bind9/lib/dns/validator.c (working copy)
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@@ -1420,7 +1420,6 @@ compute_keytag(dns_rdata_t *rdata, dns_rdata_dnske
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*/
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static isc_boolean_t
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isselfsigned(dns_validator_t *val) {
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- dns_fixedname_t fixed;
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dns_rdataset_t *rdataset, *sigrdataset;
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dns_rdata_t rdata = DNS_RDATA_INIT;
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dns_rdata_t sigrdata = DNS_RDATA_INIT;
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@@ -1476,8 +1475,7 @@ isselfsigned(dns_validator_t *val) {
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result = dns_dnssec_verify3(name, rdataset, dstkey,
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ISC_TRUE,
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val->view->maxbits,
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- mctx, &sigrdata,
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- dns_fixedname_name(&fixed));
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+ mctx, &sigrdata, NULL);
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dst_key_free(&dstkey);
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if (result != ISC_R_SUCCESS)
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continue;
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17
share/security/patches/SA-15:11/bind-9.patch.asc
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17
share/security/patches/SA-15:11/bind-9.patch.asc
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@ -0,0 +1,17 @@
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-----BEGIN PGP SIGNATURE-----
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Version: GnuPG v2.1.5 (FreeBSD)
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-----END PGP SIGNATURE-----
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@ -7,6 +7,18 @@
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<year>
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<name>2015</name>
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<month>
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<name>7</name>
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<day>
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<name>7</name>
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<advisory>
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<name>FreeBSD-SA-15:11.bind</name>
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</advisory>
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</day>
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</month>
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<month>
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<name>6</name>
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