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kex.c : additional bounds checks in diffie_hellman_sha1/256 (#361)

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Files : kex.c, misc.c, misc.h

Notes :
Fixed possible out of bounds memory access when reading malformed data in diffie_hellman_sha1() and diffie_hellman_sha256().

Added _libssh2_copy_string() to misc.c to return an allocated and filled char buffer from a string_buf offset. Removed no longer needed s var in kmdhgGPshakex_state_t.
This commit is contained in:
Will Cosgrove
2019-05-01 16:45:13 -07:00
committed by GitHub
parent dd74f2465b
commit 16f2d2bf86
4 changed files with 76 additions and 51 deletions
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src/libssh2_priv.h
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@@ -261,7 +261,6 @@ typedef struct kmdhgGPshakex_state_t
_libssh2_bn *e;
_libssh2_bn *f;
_libssh2_bn *k;
unsigned char *s;
unsigned char *f_value;
unsigned char *k_value;
unsigned char *h_sig;