From 527504e8d8ff7a1cd967ea57cb7f29b92b052bae Mon Sep 17 00:00:00 2001 From: "Heiko Schlittermann (HS12-RIPE)" Date: Mon, 27 Nov 2017 22:42:33 +0100 Subject: [PATCH] Chunking: do not treat the first lonely dot special. CVE-2017-16944, Bug 2201 --- src/src/receive.c | 2 +- src/src/smtp_in.c | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/src/src/receive.c b/src/src/receive.c index 5dc9bb584..ae2c93b4e 100644 --- a/src/src/receive.c +++ b/src/src/receive.c @@ -1859,7 +1859,7 @@ for (;;) prevent further reading), and break out of the loop, having freed the empty header, and set next = NULL to indicate no data line. */ - if (ptr == 0 && ch == '.' && (smtp_input || dot_ends)) + if (ptr == 0 && ch == '.' && dot_ends) { ch = (receive_getc)(GETC_BUFFER_UNLIMITED); if (ch == '\r') diff --git a/src/src/smtp_in.c b/src/src/smtp_in.c index 28586f33d..00e9d41a8 100644 --- a/src/src/smtp_in.c +++ b/src/src/smtp_in.c @@ -5097,17 +5097,24 @@ while (done <= 0) DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n", (int)chunking_state, chunking_data_left); + /* push the current receive_* function on the "stack", and + replace them by bdat_getc(), which in turn will use the lwr_receive_* + functions to do the dirty work. */ lwr_receive_getc = receive_getc; lwr_receive_getbuf = receive_getbuf; lwr_receive_ungetc = receive_ungetc; + receive_getc = bdat_getc; receive_ungetc = bdat_ungetc; + dot_ends = FALSE; + goto DATA_BDAT; } case DATA_CMD: HAD(SCH_DATA); + dot_ends = TRUE; DATA_BDAT: /* Common code for DATA and BDAT */ if (!discarded && recipients_count <= 0) -- 2.25.1