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diff -up openssl-1.0.2a/doc/ssl/SSL_COMP_add_compression_method.pod.env-zlib openssl-1.0.2a/doc/ssl/SSL_COMP_add_compression_method.pod
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--- openssl-1.0.2a/doc/ssl/SSL_COMP_add_compression_method.pod.env-zlib 2015-04-09 18:17:20.509637597 +0200
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+++ openssl-1.0.2a/doc/ssl/SSL_COMP_add_compression_method.pod 2015-04-09 18:17:14.767504953 +0200
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@@ -47,6 +47,13 @@ Once the identities of the compression m
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been standardized, the compression API will most likely be changed. Using
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it in the current state is not recommended.
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+It is also not recommended to use compression if data transfered contain
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+untrusted parts that can be manipulated by an attacker as he could then
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+get information about the encrypted data. See the CRIME attack. For
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+that reason the default loading of the zlib compression method is
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+disabled and enabled only if the environment variable B<OPENSSL_DEFAULT_ZLIB>
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+is present during the library initialization.
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+
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=head1 RETURN VALUES
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SSL_COMP_add_compression_method() may return the following values:
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diff -up openssl-1.0.2a/ssl/ssl_ciph.c.env-zlib openssl-1.0.2a/ssl/ssl_ciph.c
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--- openssl-1.0.2a/ssl/ssl_ciph.c.env-zlib 2015-04-09 18:17:20.510637620 +0200
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+++ openssl-1.0.2a/ssl/ssl_ciph.c 2015-04-09 18:17:20.264631937 +0200
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@@ -140,6 +140,8 @@
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* OTHERWISE.
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*/
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+/* for secure_getenv */
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+#define _GNU_SOURCE
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#include <stdio.h>
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#include <openssl/objects.h>
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#ifndef OPENSSL_NO_COMP
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@@ -450,7 +452,8 @@ static void load_builtin_compressions(vo
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MemCheck_off();
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ssl_comp_methods = sk_SSL_COMP_new(sk_comp_cmp);
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- if (ssl_comp_methods != NULL) {
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+ if (ssl_comp_methods != NULL
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+ && secure_getenv("OPENSSL_DEFAULT_ZLIB") != NULL) {
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comp = (SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
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if (comp != NULL) {
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comp->method = COMP_zlib();
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