diff -Nru ghostscript-10.0.0~dfsg1/debian/changelog ghostscript-10.0.0~dfsg1/debian/changelog --- ghostscript-10.0.0~dfsg1/debian/changelog 2023-04-25 19:29:39.000000000 +0000 +++ ghostscript-10.0.0~dfsg1/debian/changelog 2023-07-05 16:45:07.000000000 +0000 @@ -1,3 +1,14 @@ +ghostscript (10.0.0~dfsg1-0ubuntu1.2) lunar-security; urgency=medium + + * SECURITY UPDATE: incorrect permission validation for pipe devices + - debian/patches/CVE-2023-36664-1.patch: don't reduce pipe file names + for permission validation in base/gpmisc.c, base/gslibctx.c. + - debian/patches/CVE-2023-36664-2.patch: fix logic and add extra test + in base/gpmisc.c, base/gslibctx.c. + - CVE-2023-36664 + + -- Marc Deslauriers Wed, 05 Jul 2023 12:45:07 -0400 + ghostscript (10.0.0~dfsg1-0ubuntu1.1) lunar-security; urgency=medium * SECURITY UPDATE: Buffer Overflow diff -Nru ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-1.patch ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-1.patch --- ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-1.patch 1970-01-01 00:00:00.000000000 +0000 +++ ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-1.patch 2023-07-05 16:44:56.000000000 +0000 @@ -0,0 +1,142 @@ +From 5e65eeae225c7d02d447de5abaf4a8e6d234fcea Mon Sep 17 00:00:00 2001 +From: Chris Liddell +Date: Wed, 7 Jun 2023 10:23:06 +0100 +Subject: [PATCH] Bug 706761: Don't "reduce" %pipe% file names for permission + validation + +For regular file names, we try to simplfy relative paths before we use them. + +Because the %pipe% device can, effectively, accept command line calls, we +shouldn't be simplifying that string, because the command line syntax can end +up confusing the path simplifying code. That can result in permitting a pipe +command which does not match what was originally permitted. + +Special case "%pipe" in the validation code so we always deal with the entire +string. +--- + base/gpmisc.c | 31 +++++++++++++++++++-------- + base/gslibctx.c | 56 ++++++++++++++++++++++++++++++++++++------------- + 2 files changed, 64 insertions(+), 23 deletions(-) + +diff --git a/base/gpmisc.c b/base/gpmisc.c +index 38d6d60e2..cad018219 100644 +--- a/base/gpmisc.c ++++ b/base/gpmisc.c +@@ -1076,16 +1076,29 @@ gp_validate_path_len(const gs_memory_t *mem, + && !memcmp(path + cdirstrl, dirsepstr, dirsepstrl)) { + prefix_len = 0; + } +- rlen = len+1; +- bufferfull = (char *)gs_alloc_bytes(mem->thread_safe_memory, rlen + prefix_len, "gp_validate_path"); +- if (bufferfull == NULL) +- return gs_error_VMerror; +- +- buffer = bufferfull + prefix_len; +- if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) +- return gs_error_invalidfileaccess; +- buffer[rlen] = 0; + ++ /* "%pipe%" do not follow the normal rules for path definitions, so we ++ don't "reduce" them to avoid unexpected results ++ */ ++ if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ bufferfull = buffer = (char *)gs_alloc_bytes(mem->thread_safe_memory, len + 1, "gp_validate_path"); ++ if (buffer == NULL) ++ return gs_error_VMerror; ++ memcpy(buffer, path, len); ++ buffer[len] = 0; ++ rlen = len; ++ } ++ else { ++ rlen = len+1; ++ bufferfull = (char *)gs_alloc_bytes(mem->thread_safe_memory, rlen + prefix_len, "gp_validate_path"); ++ if (bufferfull == NULL) ++ return gs_error_VMerror; ++ ++ buffer = bufferfull + prefix_len; ++ if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) ++ return gs_error_invalidfileaccess; ++ buffer[rlen] = 0; ++ } + while (1) { + switch (mode[0]) + { +diff --git a/base/gslibctx.c b/base/gslibctx.c +index 186248211..3b737df4b 100644 +--- a/base/gslibctx.c ++++ b/base/gslibctx.c +@@ -740,14 +740,28 @@ gs_add_control_path_len_flags(const gs_memory_t *mem, gs_path_control_t type, co + return gs_error_rangecheck; + } + +- rlen = len+1; +- buffer = (char *)gs_alloc_bytes(core->memory, rlen, "gp_validate_path"); +- if (buffer == NULL) +- return gs_error_VMerror; ++ /* "%pipe%" do not follow the normal rules for path definitions, so we ++ don't "reduce" them to avoid unexpected results ++ */ ++ if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ buffer = (char *)gs_alloc_bytes(core->memory, len + 1, "gs_add_control_path_len"); ++ if (buffer == NULL) ++ return gs_error_VMerror; ++ memcpy(buffer, path, len); ++ buffer[len] = 0; ++ rlen = len; ++ } ++ else { ++ rlen = len + 1; + +- if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) +- return gs_error_invalidfileaccess; +- buffer[rlen] = 0; ++ buffer = (char *)gs_alloc_bytes(core->memory, rlen, "gs_add_control_path_len"); ++ if (buffer == NULL) ++ return gs_error_VMerror; ++ ++ if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) ++ return gs_error_invalidfileaccess; ++ buffer[rlen] = 0; ++ } + + n = control->num; + for (i = 0; i < n; i++) +@@ -833,14 +847,28 @@ gs_remove_control_path_len_flags(const gs_memory_t *mem, gs_path_control_t type, + return gs_error_rangecheck; + } + +- rlen = len+1; +- buffer = (char *)gs_alloc_bytes(core->memory, rlen, "gp_validate_path"); +- if (buffer == NULL) +- return gs_error_VMerror; ++ /* "%pipe%" do not follow the normal rules for path definitions, so we ++ don't "reduce" them to avoid unexpected results ++ */ ++ if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ buffer = (char *)gs_alloc_bytes(core->memory, len + 1, "gs_remove_control_path_len"); ++ if (buffer == NULL) ++ return gs_error_VMerror; ++ memcpy(buffer, path, len); ++ buffer[len] = 0; ++ rlen = len; ++ } ++ else { ++ rlen = len+1; + +- if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) +- return gs_error_invalidfileaccess; +- buffer[rlen] = 0; ++ buffer = (char *)gs_alloc_bytes(core->memory, rlen, "gs_remove_control_path_len"); ++ if (buffer == NULL) ++ return gs_error_VMerror; ++ ++ if (gp_file_name_reduce(path, (uint)len, buffer, &rlen) != gp_combine_success) ++ return gs_error_invalidfileaccess; ++ buffer[rlen] = 0; ++ } + + n = control->num; + for (i = 0; i < n; i++) { +-- +2.34.1 + diff -Nru ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-2.patch ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-2.patch --- ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-2.patch 1970-01-01 00:00:00.000000000 +0000 +++ ghostscript-10.0.0~dfsg1/debian/patches/CVE-2023-36664-2.patch 2023-07-05 16:45:04.000000000 +0000 @@ -0,0 +1,49 @@ +From fb342fdb60391073a69147cb71af1ac416a81099 Mon Sep 17 00:00:00 2001 +From: Chris Liddell +Date: Wed, 14 Jun 2023 09:08:12 +0100 +Subject: [PATCH] Bug 706778: 706761 revisit + +Two problems with the original commit. The first a silly typo inverting the +logic of a test. + +The second was forgetting that we actually actually validate two candidate +strings for pipe devices. One with the expected "%pipe%" prefix, the other +using the pipe character prefix: "|". + +This addresses both those. +--- + base/gpmisc.c | 2 +- + base/gslibctx.c | 4 ++-- + 2 files changed, 3 insertions(+), 3 deletions(-) + +--- a/base/gpmisc.c ++++ b/base/gpmisc.c +@@ -1080,7 +1080,7 @@ gp_validate_path_len(const gs_memory_t * + /* "%pipe%" do not follow the normal rules for path definitions, so we + don't "reduce" them to avoid unexpected results + */ +- if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ if (path[0] == '|' || (len > 5 && memcmp(path, "%pipe", 5) == 0)) { + bufferfull = buffer = (char *)gs_alloc_bytes(mem->thread_safe_memory, len + 1, "gp_validate_path"); + if (buffer == NULL) + return gs_error_VMerror; +--- a/base/gslibctx.c ++++ b/base/gslibctx.c +@@ -743,7 +743,7 @@ gs_add_control_path_len_flags(const gs_m + /* "%pipe%" do not follow the normal rules for path definitions, so we + don't "reduce" them to avoid unexpected results + */ +- if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ if (path[0] == '|' || (len > 5 && memcmp(path, "%pipe", 5) == 0)) { + buffer = (char *)gs_alloc_bytes(core->memory, len + 1, "gs_add_control_path_len"); + if (buffer == NULL) + return gs_error_VMerror; +@@ -850,7 +850,7 @@ gs_remove_control_path_len_flags(const g + /* "%pipe%" do not follow the normal rules for path definitions, so we + don't "reduce" them to avoid unexpected results + */ +- if (len > 5 && memcmp(path, "%pipe", 5) != 0) { ++ if (path[0] == '|' || (len > 5 && memcmp(path, "%pipe", 5) == 0)) { + buffer = (char *)gs_alloc_bytes(core->memory, len + 1, "gs_remove_control_path_len"); + if (buffer == NULL) + return gs_error_VMerror; diff -Nru ghostscript-10.0.0~dfsg1/debian/patches/series ghostscript-10.0.0~dfsg1/debian/patches/series --- ghostscript-10.0.0~dfsg1/debian/patches/series 2023-04-25 19:29:27.000000000 +0000 +++ ghostscript-10.0.0~dfsg1/debian/patches/series 2023-07-05 16:45:00.000000000 +0000 @@ -12,3 +12,5 @@ 020220925~387f094.patch CVE-2023-28879.patch CVE-2023-28879-post.patch +CVE-2023-36664-1.patch +CVE-2023-36664-2.patch