Add changelog entry for mbedtls_mpi_write_binary fix
@@ -9,6 +9,13 @@ Security
RSA decryption (i.e. ciphersuites whose name contains RSA but not
(EC)DH(E)). Reported by Eyal Ronen, Robert Gillham, Daniel Genkin, Adi
Shamir, David Wong and Yuval Yarom. CVE-2018-19608
+ * In mbedtls_mpi_write_binary(), don't leak the exact size of the number
+ via branching and memory access patterns. An attacker who could submit
+ a plaintext for RSA PKCS#1 v1.5 decryption but only observe the timing
+ of the decryption and not its result could nonetheless decrypt RSA
+ plaintexts and forge RSA signatures. Other asymmetric algorithms may
+ have been similarly vulnerable. Reported by Eyal Ronen, Robert Gillham,
+ Daniel Genkin, Adi Shamir, David Wong and Yuval Yarom.
= mbed TLS 2.13.1 branch released 2018-09-06
