A handful of CVEs were assigned for bugs in libsixel. Heap buffer overflows and integer overflows.
CVE-2019-19638 CVE-2019-19635 CVE-2019-19636 CVE-2019-19637 A pull request pointing out the issues and patching them was submitted about 10 days ago. The CVEs were assigned 3 days ago. https://github.com/saitoha/libsixel/pull/106 There hasn't been a response yet so instead of waiting for a new release I'm being proactive to get the patches applied to the port of the current version. Tim. Index: Makefile =================================================================== RCS file: /cvs/ports/graphics/libsixel/Makefile,v retrieving revision 1.5 diff -u -p -r1.5 Makefile --- Makefile 12 Jul 2019 20:47:02 -0000 1.5 +++ Makefile 11 Dec 2019 02:51:09 -0000 @@ -9,6 +9,8 @@ SHARED_LIBS += sixel 1.0 # 1.6 CATEGORIES = graphics +REVISION = 0 + HOMEPAGE = https://github.com/saitoha/libsixel MAINTAINER = Frederic Cambus <fcam...@openbsd.org> Index: patches/patch-include_sixel_h_in =================================================================== RCS file: patches/patch-include_sixel_h_in diff -N patches/patch-include_sixel_h_in --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-include_sixel_h_in 11 Dec 2019 02:51:09 -0000 @@ -0,0 +1,13 @@ +$OpenBSD$ + +Index: include/sixel.h.in +--- include/sixel.h.in.orig ++++ include/sixel.h.in +@@ -60,6 +60,7 @@ typedef int SIXELSTATUS; + #define SIXEL_BAD_ALLOCATION (SIXEL_RUNTIME_ERROR | 0x0001) /* malloc() failed */ + #define SIXEL_BAD_ARGUMENT (SIXEL_RUNTIME_ERROR | 0x0002) /* bad argument detected */ + #define SIXEL_BAD_INPUT (SIXEL_RUNTIME_ERROR | 0x0003) /* bad input detected */ ++#define SIXEL_BAD_INTEGER_OVERFLOW (SIXEL_RUNTIME_ERROR | 0x0004) /* integer overflow */ + + #define SIXEL_NOT_IMPLEMENTED (SIXEL_FEATURE_ERROR | 0x0001) /* feature not implemented */ + Index: patches/patch-src_frompnm_c =================================================================== RCS file: patches/patch-src_frompnm_c diff -N patches/patch-src_frompnm_c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-src_frompnm_c 11 Dec 2019 02:51:09 -0000 @@ -0,0 +1,23 @@ +$OpenBSD$ + +Index: src/frompnm.c +--- src/frompnm.c.orig ++++ src/frompnm.c +@@ -166,7 +166,7 @@ load_pnm(unsigned char /* in */ *p, + height = 0; + for (; *s >= '0' && *s <= '9'; ++s) { + height = height * 10 + (*s - '0'); +- if (width > PNM_MAX_WIDTH) { ++ if (height > PNM_MAX_HEIGHT) { + status = SIXEL_RUNTIME_ERROR; + sprintf( + message, +@@ -193,7 +193,7 @@ load_pnm(unsigned char /* in */ *p, + for (; *s >= '0' && *s <= '9'; ++s) { + deps = deps * 10 + (*s - '0'); + } +- if (width > PNM_MAX_WIDTH) { ++ if (deps > PNM_MAX_DEPTH) { + status = SIXEL_RUNTIME_ERROR; + sprintf( + message, Index: patches/patch-src_fromsixel_c =================================================================== RCS file: patches/patch-src_fromsixel_c diff -N patches/patch-src_fromsixel_c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-src_fromsixel_c 11 Dec 2019 02:51:09 -0000 @@ -0,0 +1,79 @@ +$OpenBSD$ + +Index: src/fromsixel.c +--- src/fromsixel.c.orig ++++ src/fromsixel.c +@@ -52,6 +52,7 @@ + #include <stdio.h> + #include <ctype.h> /* isdigit */ + #include <string.h> /* memcpy */ ++#include <limits.h> + + #if defined(HAVE_INTTYPES_H) + # include <inttypes.h> +@@ -367,7 +368,17 @@ parser_context_init(parser_context_t *context) + return status; + } + ++SIXELSTATUS safe_addition_for_params(parser_context_t *context, unsigned char *p){ ++ int x; + ++ x = *p - '0'; /* 0 <= x <= 9 */ ++ if ((context->param > INT_MAX / 10) || (x > INT_MAX - context->param * 10)) { ++ return SIXEL_BAD_INTEGER_OVERFLOW; ++ } ++ context->param = context->param * 10 + x; ++ return SIXEL_OK; ++} ++ + /* convert sixel data into indexed pixel bytes and palette data */ + SIXELAPI SIXELSTATUS + sixel_decode_raw_impl( +@@ -446,7 +457,10 @@ sixel_decode_raw_impl( + if (context->param < 0) { + context->param = 0; + } +- context->param = context->param * 10 + *p - '0'; ++ status = safe_addition_for_params(context, p); ++ if (SIXEL_FAILED(status)) { ++ goto end; ++ } + p++; + break; + case ';': +@@ -647,7 +661,10 @@ sixel_decode_raw_impl( + case '7': + case '8': + case '9': +- context->param = context->param * 10 + *p - '0'; ++ status = safe_addition_for_params(context, p); ++ if (SIXEL_FAILED(status)) { ++ goto end; ++ } + p++; + break; + case ';': +@@ -721,7 +738,10 @@ sixel_decode_raw_impl( + case '7': + case '8': + case '9': +- context->param = context->param * 10 + *p - '0'; ++ status = safe_addition_for_params(context, p); ++ if (SIXEL_FAILED(status)) { ++ goto end; ++ } + p++; + break; + default: +@@ -753,7 +773,10 @@ sixel_decode_raw_impl( + case '7': + case '8': + case '9': +- context->param = context->param * 10 + *p - '0'; ++ status = safe_addition_for_params(context, p); ++ if (SIXEL_FAILED(status)) { ++ goto end; ++ } + p++; + break; + case ';': Index: patches/patch-src_status_c =================================================================== RCS file: patches/patch-src_status_c diff -N patches/patch-src_status_c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-src_status_c 11 Dec 2019 02:51:09 -0000 @@ -0,0 +1,23 @@ +$OpenBSD$ + +Index: src/status.c +--- src/status.c.orig ++++ src/status.c +@@ -46,6 +46,7 @@ + #define SIXEL_MESSAGE_BAD_ALLOCATION ("runtime error: bad allocation error") + #define SIXEL_MESSAGE_BAD_ARGUMENT ("runtime error: bad argument detected") + #define SIXEL_MESSAGE_BAD_INPUT ("runtime error: bad input detected") ++#define SIXEL_MESSAGE_BAD_INTEGER_OVERFLOW ("runtime error: integer overflow") + #define SIXEL_MESSAGE_RUNTIME_ERROR ("runtime error") + #define SIXEL_MESSAGE_LOGIC_ERROR ("logic error") + #define SIXEL_MESSAGE_NOT_IMPLEMENTED ("feature error: not implemented") +@@ -117,6 +118,9 @@ sixel_helper_format_error( + break; + case SIXEL_BAD_INPUT: + error_string = SIXEL_MESSAGE_BAD_INPUT; ++ break; ++ case SIXEL_BAD_INTEGER_OVERFLOW: ++ error_string = SIXEL_MESSAGE_BAD_INTEGER_OVERFLOW; + break; + default: + error_string = SIXEL_MESSAGE_RUNTIME_ERROR; Index: patches/patch-src_tosixel_c =================================================================== RCS file: patches/patch-src_tosixel_c diff -N patches/patch-src_tosixel_c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-src_tosixel_c 11 Dec 2019 02:51:09 -0000 @@ -0,0 +1,53 @@ +$OpenBSD$ + +Index: src/tosixel.c +--- src/tosixel.c.orig ++++ src/tosixel.c +@@ -21,6 +21,7 @@ + #include <stdio.h> + #include <stdlib.h> + #include <string.h> ++#include <limits.h> + + #if defined(HAVE_INTTYPES_H) + # include <inttypes.h> +@@ -502,6 +503,7 @@ sixel_encode_body( + int mx; + int len; + int pix; ++ int check_integer_overflow; + unsigned char *map = NULL; + sixel_node_t *np, *tp, top; + int fillable; +@@ -557,8 +559,30 @@ sixel_encode_body( + fillable = 1; + } + for (x = 0; x < width; x++) { +- pix = pixels[y * width + x]; /* color index */ ++ if (y > INT_MAX / width) { ++ /* integer overflow */ ++ status = SIXEL_BAD_INTEGER_OVERFLOW; ++ goto end; ++ } ++ check_integer_overflow = y * width; ++ if (check_integer_overflow > INT_MAX - x) { ++ /* integer overflow */ ++ status = SIXEL_BAD_INTEGER_OVERFLOW; ++ goto end; ++ } ++ pix = pixels[check_integer_overflow + x]; /* color index */ + if (pix >= 0 && pix < ncolors && pix != keycolor) { ++ if (pix > INT_MAX / width) { ++ /* integer overflow */ ++ status = SIXEL_BAD_INTEGER_OVERFLOW; ++ goto end; ++ } ++ check_integer_overflow = pix * width; ++ if (check_integer_overflow > INT_MAX - x) { ++ /* integer overflow */ ++ status = SIXEL_BAD_INTEGER_OVERFLOW; ++ goto end; ++ } + map[pix * width + x] |= (1 << i); + } + else if (!palstate) {
