diff options
Diffstat (limited to 'gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt2.patch')
| -rw-r--r-- | gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt2.patch | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt2.patch b/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt2.patch new file mode 100644 index 0000000000..5f19bd80d3 --- /dev/null +++ b/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt2.patch @@ -0,0 +1,163 @@ +Copied from upstream nettle git repository. +Removed changes to ChangeLog, to allow this patch to apply to nettle-3.5. + +From 0ad0b5df315665250dfdaa4a1e087f4799edaefe Mon Sep 17 00:00:00 2001 +From: Niels Möller <nisse@lysator.liu.se> +Date: Mon, 17 May 2021 22:02:47 +0200 +Subject: [PATCH 2/2] Add input check to rsa_decrypt family of functions. + +--- + ChangeLog | 8 ++++++++ + rsa-decrypt-tr.c | 4 ++++ + rsa-decrypt.c | 10 ++++++++++ + rsa-sec-decrypt.c | 4 ++++ + rsa.h | 5 +++-- + testsuite/rsa-encrypt-test.c | 38 ++++++++++++++++++++++++++++++------ + 6 files changed, 61 insertions(+), 8 deletions(-) + +diff --git a/rsa-decrypt-tr.c b/rsa-decrypt-tr.c +index 927a8915..4a9e9d74 100644 +--- a/rsa-decrypt-tr.c ++++ b/rsa-decrypt-tr.c +@@ -52,6 +52,10 @@ rsa_decrypt_tr(const struct rsa_public_key *pub, + mp_size_t key_limb_size; + int res; + ++ /* First check that input is in range. */ ++ if (mpz_sgn (gibberish) < 0 || mpz_cmp (gibberish, pub->n) >= 0) ++ return 0; ++ + key_limb_size = mpz_size(pub->n); + + TMP_GMP_ALLOC (m, key_limb_size); +diff --git a/rsa-decrypt.c b/rsa-decrypt.c +index 7681439d..540d8baa 100644 +--- a/rsa-decrypt.c ++++ b/rsa-decrypt.c +@@ -48,6 +48,16 @@ rsa_decrypt(const struct rsa_private_key *key, + int res; + + mpz_init(m); ++ ++ /* First check that input is in range. Since we don't have the ++ public key available here, we need to reconstruct n. */ ++ mpz_mul (m, key->p, key->q); ++ if (mpz_sgn (gibberish) < 0 || mpz_cmp (gibberish, m) >= 0) ++ { ++ mpz_clear (m); ++ return 0; ++ } ++ + rsa_compute_root(key, m, gibberish); + + res = pkcs1_decrypt (key->size, m, length, message); +diff --git a/rsa-sec-decrypt.c b/rsa-sec-decrypt.c +index fc4757a0..4c98958d 100644 +--- a/rsa-sec-decrypt.c ++++ b/rsa-sec-decrypt.c +@@ -55,6 +55,10 @@ rsa_sec_decrypt(const struct rsa_public_key *pub, + TMP_GMP_DECL (em, uint8_t); + int res; + ++ /* First check that input is in range. */ ++ if (mpz_sgn (gibberish) < 0 || mpz_cmp (gibberish, pub->n) >= 0) ++ return 0; ++ + TMP_GMP_ALLOC (m, mpz_size(pub->n)); + TMP_GMP_ALLOC (em, key->size); + +diff --git a/rsa.h b/rsa.h +index 3b10155f..2dd35a2d 100644 +--- a/rsa.h ++++ b/rsa.h +@@ -428,13 +428,14 @@ rsa_sec_decrypt(const struct rsa_public_key *pub, + size_t length, uint8_t *message, + const mpz_t gibberish); + +-/* Compute x, the e:th root of m. Calling it with x == m is allowed. */ ++/* Compute x, the e:th root of m. Calling it with x == m is allowed. ++ It is required that 0 <= m < n. */ + void + rsa_compute_root(const struct rsa_private_key *key, + mpz_t x, const mpz_t m); + + /* Safer variant, using RSA blinding, and checking the result after +- CRT. */ ++ CRT. It is required that 0 <= m < n. */ + int + rsa_compute_root_tr(const struct rsa_public_key *pub, + const struct rsa_private_key *key, +diff --git a/testsuite/rsa-encrypt-test.c b/testsuite/rsa-encrypt-test.c +index d3bc374b..d1a440f6 100644 +--- a/testsuite/rsa-encrypt-test.c ++++ b/testsuite/rsa-encrypt-test.c +@@ -19,11 +19,12 @@ test_main(void) + uint8_t after; + + mpz_t gibberish; +- mpz_t zero; ++ mpz_t bad_input; + + rsa_private_key_init(&key); + rsa_public_key_init(&pub); + mpz_init(gibberish); ++ mpz_init(bad_input); + + knuth_lfib_init(&lfib, 17); + +@@ -103,15 +104,40 @@ test_main(void) + ASSERT(decrypted[0] == 'A'); + + /* Test zero input. */ +- mpz_init_set_ui (zero, 0); ++ mpz_set_ui (bad_input, 0); + decrypted_length = msg_length; +- ASSERT(!rsa_decrypt(&key, &decrypted_length, decrypted, zero)); ++ ASSERT(!rsa_decrypt(&key, &decrypted_length, decrypted, bad_input)); + ASSERT(!rsa_decrypt_tr(&pub, &key, + &lfib, (nettle_random_func *) knuth_lfib_random, +- &decrypted_length, decrypted, zero)); ++ &decrypted_length, decrypted, bad_input)); + ASSERT(!rsa_sec_decrypt(&pub, &key, + &lfib, (nettle_random_func *) knuth_lfib_random, +- decrypted_length, decrypted, zero)); ++ decrypted_length, decrypted, bad_input)); ++ ASSERT(decrypted_length == msg_length); ++ ++ /* Test input that is slightly larger than n */ ++ mpz_add(bad_input, gibberish, pub.n); ++ decrypted_length = msg_length; ++ ASSERT(!rsa_decrypt(&key, &decrypted_length, decrypted, bad_input)); ++ ASSERT(!rsa_decrypt_tr(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ &decrypted_length, decrypted, bad_input)); ++ ASSERT(!rsa_sec_decrypt(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ decrypted_length, decrypted, bad_input)); ++ ASSERT(decrypted_length == msg_length); ++ ++ /* Test input that is considerably larger than n */ ++ mpz_mul_2exp (bad_input, pub.n, 100); ++ mpz_add (bad_input, bad_input, gibberish); ++ decrypted_length = msg_length; ++ ASSERT(!rsa_decrypt(&key, &decrypted_length, decrypted, bad_input)); ++ ASSERT(!rsa_decrypt_tr(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ &decrypted_length, decrypted, bad_input)); ++ ASSERT(!rsa_sec_decrypt(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ decrypted_length, decrypted, bad_input)); + ASSERT(decrypted_length == msg_length); + + /* Test invalid key. */ +@@ -124,6 +150,6 @@ test_main(void) + rsa_private_key_clear(&key); + rsa_public_key_clear(&pub); + mpz_clear(gibberish); +- mpz_clear(zero); ++ mpz_clear(bad_input); + free(decrypted); + } +-- +2.31.1 + |