diff options
Diffstat (limited to 'meta/recipes-devtools/rpm/files/CVE-2021-3521.patch')
-rw-r--r-- | meta/recipes-devtools/rpm/files/CVE-2021-3521.patch | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/meta/recipes-devtools/rpm/files/CVE-2021-3521.patch b/meta/recipes-devtools/rpm/files/CVE-2021-3521.patch new file mode 100644 index 0000000000..cb9e9842fe --- /dev/null +++ b/meta/recipes-devtools/rpm/files/CVE-2021-3521.patch @@ -0,0 +1,330 @@ +From bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8 Mon Sep 17 00:00:00 2001 +From: Panu Matilainen <pmatilai@redhat.com> +Date: Thu, 30 Sep 2021 09:59:30 +0300 +Subject: [PATCH] Validate and require subkey binding signatures on PGP public + keys + +All subkeys must be followed by a binding signature by the primary key +as per the OpenPGP RFC, enforce the presence and validity in the parser. + +The implementation is as kludgey as they come to work around our +simple-minded parser structure without touching API, to maximise +backportability. Store all the raw packets internally as we decode them +to be able to access previous elements at will, needed to validate ordering +and access the actual data. Add testcases for manipulated keys whose +import previously would succeed. + +Depends on the two previous commits: +7b399fcb8f52566e6f3b4327197a85facd08db91 and +236b802a4aa48711823a191d1b7f753c82a89ec5 + +CVE: CVE-2021-3521 +Upstream-Status: Backport [https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8] +Comment: Hunk refreshed +Signed-off-by: Riyaz Khan <Riyaz.Khan@kpit.com> + +Fixes CVE-2021-3521. +--- + rpmio/rpmpgp.c | 98 +++++++++++++++++-- + tests/Makefile.am | 3 + + tests/data/keys/CVE-2021-3521-badbind.asc | 25 +++++ + .../data/keys/CVE-2021-3521-nosubsig-last.asc | 25 +++++ + tests/data/keys/CVE-2021-3521-nosubsig.asc | 37 +++++++ + tests/rpmsigdig.at | 28 ++++++ + 6 files changed, 209 insertions(+), 7 deletions(-) + create mode 100644 tests/data/keys/CVE-2021-3521-badbind.asc + create mode 100644 tests/data/keys/CVE-2021-3521-nosubsig-last.asc + create mode 100644 tests/data/keys/CVE-2021-3521-nosubsig.asc + +diff --git a/rpmio/rpmpgp.c b/rpmio/rpmpgp.c +index aad7c275c9..d70802ae86 100644 +--- a/rpmio/rpmpgp.c ++++ b/rpmio/rpmpgp.c +@@ -1004,37 +1004,121 @@ static pgpDigParams pgpDigParamsNew(uint8_t tag) + return digp; + } + ++static int hashKey(DIGEST_CTX hash, const struct pgpPkt *pkt, int exptag) ++{ ++ int rc = -1; ++ if (pkt->tag == exptag) { ++ uint8_t head[] = { ++ 0x99, ++ (pkt->blen >> 8), ++ (pkt->blen ), ++ }; ++ ++ rpmDigestUpdate(hash, head, 3); ++ rpmDigestUpdate(hash, pkt->body, pkt->blen); ++ rc = 0; ++ } ++ return rc; ++} ++ ++static int pgpVerifySelf(pgpDigParams key, pgpDigParams selfsig, ++ const struct pgpPkt *all, int i) ++{ ++ int rc = -1; ++ DIGEST_CTX hash = NULL; ++ ++ switch (selfsig->sigtype) { ++ case PGPSIGTYPE_SUBKEY_BINDING: ++ hash = rpmDigestInit(selfsig->hash_algo, 0); ++ if (hash) { ++ rc = hashKey(hash, &all[0], PGPTAG_PUBLIC_KEY); ++ if (!rc) ++ rc = hashKey(hash, &all[i-1], PGPTAG_PUBLIC_SUBKEY); ++ } ++ break; ++ default: ++ /* ignore types we can't handle */ ++ rc = 0; ++ break; ++ } ++ ++ if (hash && rc == 0) ++ rc = pgpVerifySignature(key, selfsig, hash); ++ ++ rpmDigestFinal(hash, NULL, NULL, 0); ++ ++ return rc; ++} ++ + int pgpPrtParams(const uint8_t * pkts, size_t pktlen, unsigned int pkttype, + pgpDigParams * ret) + { + const uint8_t *p = pkts; + const uint8_t *pend = pkts + pktlen; + pgpDigParams digp = NULL; +- struct pgpPkt pkt; ++ pgpDigParams selfsig = NULL; ++ int i = 0; ++ int alloced = 16; /* plenty for normal cases */ ++ struct pgpPkt *all = xmalloc(alloced * sizeof(*all)); + int rc = -1; /* assume failure */ ++ int expect = 0; ++ int prevtag = 0; + + while (p < pend) { +- if (decodePkt(p, (pend - p), &pkt)) ++ struct pgpPkt *pkt = &all[i]; ++ if (decodePkt(p, (pend - p), pkt)) + break; + + if (digp == NULL) { +- if (pkttype && pkt.tag != pkttype) { ++ if (pkttype && pkt->tag != pkttype) { + break; + } else { +- digp = pgpDigParamsNew(pkt.tag); ++ digp = pgpDigParamsNew(pkt->tag); + } + } + +- if (pgpPrtPkt(&pkt, digp)) ++ if (expect) { ++ if (pkt->tag != expect) ++ break; ++ selfsig = pgpDigParamsNew(pkt->tag); ++ } ++ ++ if (pgpPrtPkt(pkt, selfsig ? selfsig : digp)) + break; + +- p += (pkt.body - pkt.head) + pkt.blen; ++ if (selfsig) { ++ /* subkeys must be followed by binding signature */ ++ if (prevtag == PGPTAG_PUBLIC_SUBKEY) { ++ if (selfsig->sigtype != PGPSIGTYPE_SUBKEY_BINDING) ++ break; ++ } ++ ++ int xx = pgpVerifySelf(digp, selfsig, all, i); ++ ++ selfsig = pgpDigParamsFree(selfsig); ++ if (xx) ++ break; ++ expect = 0; ++ } ++ ++ if (pkt->tag == PGPTAG_PUBLIC_SUBKEY) ++ expect = PGPTAG_SIGNATURE; ++ prevtag = pkt->tag; ++ ++ i++; ++ p += (pkt->body - pkt->head) + pkt->blen; + if (pkttype == PGPTAG_SIGNATURE) + break; ++ ++ if (alloced <= i) { ++ alloced *= 2; ++ all = xrealloc(all, alloced * sizeof(*all)); ++ } + } + +- rc = (digp && (p == pend)) ? 0 : -1; ++ rc = (digp && (p == pend) && expect == 0) ? 0 : -1; + ++ free(all); + if (ret && rc == 0) { + *ret = digp; + } else { +diff --git a/tests/Makefile.am b/tests/Makefile.am +index b4a2e2e1ce..bc535d2833 100644 +--- a/tests/Makefile.am ++++ b/tests/Makefile.am +@@ -87,6 +87,9 @@ EXTRA_DIST += data/SPECS/hello-config-buildid.spec + EXTRA_DIST += data/SPECS/hello-cd.spec + EXTRA_DIST += data/keys/rpm.org-rsa-2048-test.pub + EXTRA_DIST += data/keys/rpm.org-rsa-2048-test.secret ++EXTRA_DIST += data/keys/CVE-2021-3521-badbind.asc ++EXTRA_DIST += data/keys/CVE-2021-3521-nosubsig.asc ++EXTRA_DIST += data/keys/CVE-2021-3521-nosubsig-last.asc + EXTRA_DIST += data/macros.testfile + + # testsuite voodoo +diff --git a/tests/data/keys/CVE-2021-3521-badbind.asc b/tests/data/keys/CVE-2021-3521-badbind.asc +new file mode 100644 +index 0000000000..aea00f9d7a +--- /dev/null ++++ b/tests/data/keys/CVE-2021-3521-badbind.asc +@@ -0,0 +1,25 @@ ++-----BEGIN PGP PUBLIC KEY BLOCK----- ++Version: rpm-4.17.90 (NSS-3) ++ ++mQENBFjmORgBCAC7TMEk6wnjSs8Dr4yqSScWdU2pjcqrkTxuzdWvowcIUPZI0w/g ++HkRqGd4apjvY2V15kjL10gk3QhFP3pZ/9p7zh8o8NHX7aGdSGDK7NOq1eFaErPRY ++91LW9RiZ0lbOjXEzIL0KHxUiTQEmdXJT43DJMFPyW9fkCWg0OltiX618FUdWWfI8 ++eySdLur1utnqBvdEbCUvWK2RX3vQZQdvEBODnNk2pxqTyV0w6VPQ96W++lF/5Aas ++7rUv3HIyIXxIggc8FRrnH+y9XvvHDonhTIlGnYZN4ubm9i4y3gOkrZlGTrEw7elQ ++1QeMyG2QQEbze8YjpTm4iLABCBrRfPRaQpwrABEBAAG0IXJwbS5vcmcgUlNBIHRl ++c3RrZXkgPHJzYUBycG0ub3JnPokBNwQTAQgAIQUCWOY5GAIbAwULCQgHAgYVCAkK ++CwIEFgIDAQIeAQIXgAAKCRBDRFkeGWTF/MxxCACnjqFL+MmPh9W9JQKT2DcLbBzf ++Cqo6wcEBoCOcwgRSk8dSikhARoteoa55JRJhuMyeKhhEAogE9HRmCPFdjezFTwgB ++BDVBpO2dZ023mLXDVCYX3S8pShOgCP6Tn4wqCnYeAdLcGg106N4xcmgtcssJE+Pr ++XzTZksbZsrTVEmL/Ym+R5w5jBfFnGk7Yw7ndwfQsfNXQb5AZynClFxnX546lcyZX ++fEx3/e6ezw57WNOUK6WT+8b+EGovPkbetK/rGxNXuWaP6X4A/QUm8O98nCuHYFQq +++mvNdsCBqGf7mhaRGtpHk/JgCn5rFvArMDqLVrR9hX0LdCSsH7EGE+bR3r7wuQEN ++BFjmORgBCACk+vDZrIXQuFXEYToZVwb2attzbbJJCqD71vmZTLsW0QxuPKRgbcYY ++zp4K4lVBnHhFrF8MOUOxJ7kQWIJZMZFt+BDcptCYurbD2H4W2xvnWViiC+LzCMzz ++iMJT6165uefL4JHTDPxC2fFiM9yrc72LmylJNkM/vepT128J5Qv0gRUaQbHiQuS6 ++Dm/+WRnUfx3i89SV4mnBxb/Ta93GVqoOciWwzWSnwEnWYAvOb95JL4U7c5J5f/+c ++KnQDHsW7sIiIdscsWzvgf6qs2Ra1Zrt7Fdk4+ZS2f/adagLhDO1C24sXf5XfMk5m ++L0OGwZSr9m5s17VXxfspgU5ugc8kBJfzABEBAAE= ++=WCfs ++-----END PGP PUBLIC KEY BLOCK----- ++ +diff --git a/tests/data/keys/CVE-2021-3521-nosubsig-last.asc b/tests/data/keys/CVE-2021-3521-nosubsig-last.asc +new file mode 100644 +index 0000000000..aea00f9d7a +--- /dev/null ++++ b/tests/data/keys/CVE-2021-3521-nosubsig-last.asc +@@ -0,0 +1,25 @@ ++-----BEGIN PGP PUBLIC KEY BLOCK----- ++Version: rpm-4.17.90 (NSS-3) ++ ++mQENBFjmORgBCAC7TMEk6wnjSs8Dr4yqSScWdU2pjcqrkTxuzdWvowcIUPZI0w/g ++HkRqGd4apjvY2V15kjL10gk3QhFP3pZ/9p7zh8o8NHX7aGdSGDK7NOq1eFaErPRY ++91LW9RiZ0lbOjXEzIL0KHxUiTQEmdXJT43DJMFPyW9fkCWg0OltiX618FUdWWfI8 ++eySdLur1utnqBvdEbCUvWK2RX3vQZQdvEBODnNk2pxqTyV0w6VPQ96W++lF/5Aas ++7rUv3HIyIXxIggc8FRrnH+y9XvvHDonhTIlGnYZN4ubm9i4y3gOkrZlGTrEw7elQ ++1QeMyG2QQEbze8YjpTm4iLABCBrRfPRaQpwrABEBAAG0IXJwbS5vcmcgUlNBIHRl ++c3RrZXkgPHJzYUBycG0ub3JnPokBNwQTAQgAIQUCWOY5GAIbAwULCQgHAgYVCAkK ++CwIEFgIDAQIeAQIXgAAKCRBDRFkeGWTF/MxxCACnjqFL+MmPh9W9JQKT2DcLbBzf ++Cqo6wcEBoCOcwgRSk8dSikhARoteoa55JRJhuMyeKhhEAogE9HRmCPFdjezFTwgB ++BDVBpO2dZ023mLXDVCYX3S8pShOgCP6Tn4wqCnYeAdLcGg106N4xcmgtcssJE+Pr ++XzTZksbZsrTVEmL/Ym+R5w5jBfFnGk7Yw7ndwfQsfNXQb5AZynClFxnX546lcyZX ++fEx3/e6ezw57WNOUK6WT+8b+EGovPkbetK/rGxNXuWaP6X4A/QUm8O98nCuHYFQq +++mvNdsCBqGf7mhaRGtpHk/JgCn5rFvArMDqLVrR9hX0LdCSsH7EGE+bR3r7wuQEN ++BFjmORgBCACk+vDZrIXQuFXEYToZVwb2attzbbJJCqD71vmZTLsW0QxuPKRgbcYY ++zp4K4lVBnHhFrF8MOUOxJ7kQWIJZMZFt+BDcptCYurbD2H4W2xvnWViiC+LzCMzz ++iMJT6165uefL4JHTDPxC2fFiM9yrc72LmylJNkM/vepT128J5Qv0gRUaQbHiQuS6 ++Dm/+WRnUfx3i89SV4mnBxb/Ta93GVqoOciWwzWSnwEnWYAvOb95JL4U7c5J5f/+c ++KnQDHsW7sIiIdscsWzvgf6qs2Ra1Zrt7Fdk4+ZS2f/adagLhDO1C24sXf5XfMk5m ++L0OGwZSr9m5s17VXxfspgU5ugc8kBJfzABEBAAE= ++=WCfs ++-----END PGP PUBLIC KEY BLOCK----- ++ +diff --git a/tests/data/keys/CVE-2021-3521-nosubsig.asc b/tests/data/keys/CVE-2021-3521-nosubsig.asc +new file mode 100644 +index 0000000000..3a2e7417f8 +--- /dev/null ++++ b/tests/data/keys/CVE-2021-3521-nosubsig.asc +@@ -0,0 +1,37 @@ ++-----BEGIN PGP PUBLIC KEY BLOCK----- ++Version: rpm-4.17.90 (NSS-3) ++ ++mQENBFjmORgBCAC7TMEk6wnjSs8Dr4yqSScWdU2pjcqrkTxuzdWvowcIUPZI0w/g ++HkRqGd4apjvY2V15kjL10gk3QhFP3pZ/9p7zh8o8NHX7aGdSGDK7NOq1eFaErPRY ++91LW9RiZ0lbOjXEzIL0KHxUiTQEmdXJT43DJMFPyW9fkCWg0OltiX618FUdWWfI8 ++eySdLur1utnqBvdEbCUvWK2RX3vQZQdvEBODnNk2pxqTyV0w6VPQ96W++lF/5Aas ++7rUv3HIyIXxIggc8FRrnH+y9XvvHDonhTIlGnYZN4ubm9i4y3gOkrZlGTrEw7elQ ++1QeMyG2QQEbze8YjpTm4iLABCBrRfPRaQpwrABEBAAG0IXJwbS5vcmcgUlNBIHRl ++c3RrZXkgPHJzYUBycG0ub3JnPokBNwQTAQgAIQUCWOY5GAIbAwULCQgHAgYVCAkK ++CwIEFgIDAQIeAQIXgAAKCRBDRFkeGWTF/MxxCACnjqFL+MmPh9W9JQKT2DcLbBzf ++Cqo6wcEBoCOcwgRSk8dSikhARoteoa55JRJhuMyeKhhEAogE9HRmCPFdjezFTwgB ++BDVBpO2dZ023mLXDVCYX3S8pShOgCP6Tn4wqCnYeAdLcGg106N4xcmgtcssJE+Pr ++XzTZksbZsrTVEmL/Ym+R5w5jBfFnGk7Yw7ndwfQsfNXQb5AZynClFxnX546lcyZX ++fEx3/e6ezw57WNOUK6WT+8b+EGovPkbetK/rGxNXuWaP6X4A/QUm8O98nCuHYFQq +++mvNdsCBqGf7mhaRGtpHk/JgCn5rFvArMDqLVrR9hX0LdCSsH7EGE+bR3r7wuQEN ++BFjmORgBCACk+vDZrIXQuFXEYToZVwb2attzbbJJCqD71vmZTLsW0QxuPKRgbcYY ++zp4K4lVBnHhFrF8MOUOxJ7kQWIJZMZFt+BDcptCYurbD2H4W2xvnWViiC+LzCMzz ++iMJT6165uefL4JHTDPxC2fFiM9yrc72LmylJNkM/vepT128J5Qv0gRUaQbHiQuS6 ++Dm/+WRnUfx3i89SV4mnBxb/Ta93GVqoOciWwzWSnwEnWYAvOb95JL4U7c5J5f/+c ++KnQDHsW7sIiIdscsWzvgf6qs2Ra1Zrt7Fdk4+ZS2f/adagLhDO1C24sXf5XfMk5m ++L0OGwZSr9m5s17VXxfspgU5ugc8kBJfzABEBAAG5AQ0EWOY5GAEIAKT68NmshdC4 ++VcRhOhlXBvZq23NtskkKoPvW+ZlMuxbRDG48pGBtxhjOngriVUGceEWsXww5Q7En ++uRBYglkxkW34ENym0Ji6tsPYfhbbG+dZWKIL4vMIzPOIwlPrXrm558vgkdMM/ELZ ++8WIz3KtzvYubKUk2Qz+96lPXbwnlC/SBFRpBseJC5LoOb/5ZGdR/HeLz1JXiacHF ++v9Nr3cZWqg5yJbDNZKfASdZgC85v3kkvhTtzknl//5wqdAMexbuwiIh2xyxbO+B/ ++qqzZFrVmu3sV2Tj5lLZ/9p1qAuEM7ULbixd/ld8yTmYvQ4bBlKv2bmzXtVfF+ymB ++Tm6BzyQEl/MAEQEAAYkBHwQYAQgACQUCWOY5GAIbDAAKCRBDRFkeGWTF/PANB/9j ++mifmj6z/EPe0PJFhrpISt9PjiUQCt0IPtiL5zKAkWjHePIzyi+0kCTBF6DDLFxos ++3vN4bWnVKT1kBhZAQlPqpJTg+m74JUYeDGCdNx9SK7oRllATqyu+5rncgxjWVPnQ ++zu/HRPlWJwcVFYEVXYL8xzfantwQTqefjmcRmBRdA2XJITK+hGWwAmrqAWx+q5xX ++Pa8wkNMxVzNS2rUKO9SoVuJ/wlUvfoShkJ/VJ5HDp3qzUqncADfdGN35TDzscngQ ++gHvnMwVBfYfSCABV1hNByoZcc/kxkrWMmsd/EnIyLd1Q1baKqc3cEDuC6E6/o4yJ ++E4XX4jtDmdZPreZALsiB ++=rRop ++-----END PGP PUBLIC KEY BLOCK----- ++ +diff --git a/tests/rpmsigdig.at b/tests/rpmsigdig.at +index 0f8f2b4884..c8b9f139e1 100644 +--- a/tests/rpmsigdig.at ++++ b/tests/rpmsigdig.at +@@ -240,6 +240,34 @@ gpg(185e6146f00650f8) = 4:185e6146f00650f8-58e63918 + []) + AT_CLEANUP + ++AT_SETUP([rpmkeys --import invalid keys]) ++AT_KEYWORDS([rpmkeys import]) ++RPMDB_INIT ++ ++AT_CHECK([ ++runroot rpmkeys --import /data/keys/CVE-2021-3521-badbind.asc ++], ++[1], ++[], ++[error: /data/keys/CVE-2021-3521-badbind.asc: key 1 import failed.] ++) ++AT_CHECK([ ++runroot rpmkeys --import /data/keys/CVE-2021-3521-nosubsig.asc ++], ++[1], ++[], ++[error: /data/keys/CVE-2021-3521-nosubsig.asc: key 1 import failed.] ++) ++ ++AT_CHECK([ ++runroot rpmkeys --import /data/keys/CVE-2021-3521-nosubsig-last.asc ++], ++[1], ++[], ++[error: /data/keys/CVE-2021-3521-nosubsig-last.asc: key 1 import failed.] ++) ++AT_CLEANUP ++ + # ------------------------------ + # Test pre-built package verification + AT_SETUP([rpmkeys -K <signed> 1]) + |