VAR-201001-0329

Vulnerability from variot - Updated: 2022-05-04 09:19

Apache HTTP Server is a popular web server. The Apache server's mod_proxy module has an integer overflow vulnerability that can eventually cause a heap overflow when performing character type conversions. The following is a vulnerable code snippet: \"./src/modules/proxy/proxy_util.c\"long int ap_proxy_send_fb(BUFF f, request_rec r, cache_req c, off_t len, int nowrite, int chunked, size_t recv_buffer_size){ ... size_t buf_size; long remaining = 0;... for (end_of_chunk = ok = 1; ok;) {... if (chunked) { long chunk_start = 0; n = 0; / start of a new chunk / if (end_of_chunk) { end_of_chunk = 0; / get the chunk size from the stream / chunk_start = ap_getline(buf, buf_size, f, 0); <-------------- -- [0] reading line from traffic (socket) if ((chunk_start <= 0) || ((size_t)chunk_start + 1 >= buf_size) || !ap_isxdigit(buf)) { n = -1; } / * parse the chunk size / else { remaining = ap_get_chunk_size(buf); <---------------- [1] convert readed data to 'long' size! if (re Maining == 0) { / Last chunk indicated, get footers /... } } else if (remaining < 0) { n = -1; ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, r, \"proxy: Remote protocol error, invalid chunk size\"); } } } / read the chunk */ if (remaining > 0) { n = ap_bread(f, buf, MIN((int)buf_size, (int)remaining)); ------------- [2] convert 'long' to 'int' !!!! if (n > -1) { remaining -= n; end_of_chunk = (remaining == 0); } }......}When the server reads the HTTP header, if it is a block connection, it will wait at [0] and read the block size data from the socket, which will be received at [1]. The data to be converted to a long type; if there is a positive block size, [2] directly converts the long type to an int type, which is An integer overflow may be triggered on the amd64 architecture.

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