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SUSE:SLE-12-SP2:Update
compat-openssl098.12531
openssl-CVE-2016-6302.patch
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File openssl-CVE-2016-6302.patch of Package compat-openssl098.12531
commit 1bbe48ab149893a78bf99c8eb8895c928900a16f Author: Dr. Stephen Henson <steve@openssl.org> Date: Tue Aug 23 18:14:54 2016 +0100 Sanity check ticket length. If a ticket callback changes the HMAC digest to SHA512 the existing sanity checks are not sufficient and an attacker could perform a DoS attack with a malformed ticket. Add additional checks based on HMAC size. Thanks to Shi Lei for reporting this bug. CVE-2016-6302 Reviewed-by: Rich Salz <rsalz@openssl.org> (cherry picked from commit baaabfd8fdcec04a691695fad9a664bea43202b6) Index: openssl-0.9.8j/ssl/t1_lib.c =================================================================== --- openssl-0.9.8j.orig/ssl/t1_lib.c 2016-09-22 17:57:11.192433068 +0200 +++ openssl-0.9.8j/ssl/t1_lib.c 2016-09-22 18:01:03.684139923 +0200 @@ -941,9 +941,7 @@ static int tls_decrypt_ticket(SSL *s, co HMAC_CTX hctx; EVP_CIPHER_CTX ctx; SSL_CTX *tctx = s->initial_ctx; - /* Need at least keyname + iv + some encrypted data */ - if (eticklen < 48) - goto tickerr; + /* Initialize session ticket encryption and HMAC contexts */ HMAC_CTX_init(&hctx); EVP_CIPHER_CTX_init(&ctx); @@ -972,6 +970,14 @@ static int tls_decrypt_ticket(SSL *s, co /* Attempt to process session ticket, first conduct sanity and * integrity checks on ticket. */ + + /* Sanity check ticket length: must exceed keyname + IV + HMAC */ + if (eticklen <= 16 + EVP_CIPHER_CTX_iv_length(&ctx) + mlen) { + HMAC_CTX_cleanup(&hctx); + EVP_CIPHER_CTX_cleanup(&ctx); + goto tickerr; + } + mlen = HMAC_size(&hctx); eticklen -= mlen; /* Check HMAC of encrypted ticket */
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