{"id":1765,"date":"2017-05-07T20:17:52","date_gmt":"2017-05-07T18:17:52","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1765"},"modified":"2017-05-09T10:05:24","modified_gmt":"2017-05-09T08:05:24","slug":"lrzip-use-after-free-in-read_stream-stream-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/05\/07\/lrzip-use-after-free-in-read_stream-stream-c\/","title":{"rendered":"lrzip: use-after-free in read_stream (stream.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"https:\/\/github.com\/ckolivas\/lrzip\">lrzip<\/a> is a compression utility that excels at compressing large files.<\/p>\n<p>The complete ASan output of the issue:<\/p>\n<pre><font size=\"2\"># lrzip -t $FILE\r\n==4026==ERROR: AddressSanitizer: heap-use-after-free on address 0x62100000dd00 at pc 0x0000004bccc5 bp 0x7ffcf3b4d9f0 sp 0x7ffcf3b4d1a0\r\nREAD of size 1 at 0x62100000dd00 thread T0\r\n    #0 0x4bccc4 in __asan_memcpy \/tmp\/portage\/sys-devel\/llvm-3.9.1-r1\/work\/llvm-3.9.1.src\/projects\/compiler-rt\/lib\/asan\/asan_interceptors.cc:413\r\n    #1 0x53cff6 in read_stream \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1747:4\r\n    #2 0x5307fc in read_vchars \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:79:6\r\n    #3 0x5307fc in unzip_match \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:208\r\n    #4 0x5307fc in runzip_chunk \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:329\r\n    #5 0x5307fc in runzip_fd \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:382\r\n    #6 0x519b41 in decompress_file \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/lrzip.c:826:6\r\n    #7 0x511074 in main \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/main.c:669:4\r\n    #8 0x7f743a5d278f in __libc_start_main \/tmp\/portage\/sys-libs\/glibc-2.23-r3\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n    #9 0x41abf8 in _init (\/usr\/bin\/lrzip+0x41abf8)\r\n\r\n0x62100000dd00 is located 0 bytes inside of 4096-byte region [0x62100000dd00,0x62100000ed00)\r\nfreed by thread T0 here:\r\n    #0 0x4d3660 in free \/tmp\/portage\/sys-devel\/llvm-3.9.1-r1\/work\/llvm-3.9.1.src\/projects\/compiler-rt\/lib\/asan\/asan_malloc_linux.cc:47\r\n    #1 0x53d186 in fill_buffer \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1574:3\r\n    #2 0x53d186 in read_stream \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1755\r\n    #3 0x5307fc in read_vchars \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:79:6\r\n    #4 0x5307fc in unzip_match \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:208\r\n    #5 0x5307fc in runzip_chunk \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:329\r\n    #6 0x5307fc in runzip_fd \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:382\r\n    #7 0x519b41 in decompress_file \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/lrzip.c:826:6\r\n    #8 0x511074 in main \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/main.c:669:4\r\n    #9 0x7f743a5d278f in __libc_start_main \/tmp\/portage\/sys-libs\/glibc-2.23-r3\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n\r\npreviously allocated by thread T1 here:\r\n    #0 0x4d39b8 in malloc \/tmp\/portage\/sys-devel\/llvm-3.9.1-r1\/work\/llvm-3.9.1.src\/projects\/compiler-rt\/lib\/asan\/asan_malloc_linux.cc:64\r\n    #1 0x54b0d7 in lzma_decompress_buf \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:546:20\r\n    #2 0x54b0d7 in ucompthread \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1522\r\n    #3 0x7f743b36e4a3 in start_thread \/tmp\/portage\/sys-libs\/glibc-2.23-r3\/work\/glibc-2.23\/nptl\/pthread_create.c:333\r\n\r\nThread T1 created by T0 here:\r\n    #0 0x42d49d in pthread_create \/tmp\/portage\/sys-devel\/llvm-3.9.1-r1\/work\/llvm-3.9.1.src\/projects\/compiler-rt\/lib\/asan\/asan_interceptors.cc:245\r\n    #1 0x53e70f in create_pthread \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:133:6\r\n    #2 0x53e70f in fill_buffer \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1673\r\n    #3 0x53e70f in read_stream \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/stream.c:1755\r\n    #4 0x5303e3 in read_u8 \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:55:6\r\n    #5 0x5303e3 in read_header \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:144\r\n    #6 0x5303e3 in runzip_chunk \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:314\r\n    #7 0x5303e3 in runzip_fd \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/runzip.c:382\r\n    #8 0x519b41 in decompress_file \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/lrzip.c:826:6\r\n    #9 0x511074 in main \/tmp\/portage\/app-arch\/lrzip-0.631\/work\/lrzip-0.631\/main.c:669:4\r\n    #10 0x7f743a5d278f in __libc_start_main \/tmp\/portage\/sys-libs\/glibc-2.23-r3\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n\r\nSUMMARY: AddressSanitizer: heap-use-after-free \/tmp\/portage\/sys-devel\/llvm-3.9.1-r1\/work\/llvm-3.9.1.src\/projects\/compiler-rt\/lib\/asan\/asan_interceptors.cc:413 in __asan_memcpy\r\nShadow bytes around the buggy address:\r\n  0x0c427fff9b50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c427fff9b60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c427fff9b70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c427fff9b80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c427fff9b90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n=&gt;0x0c427fff9ba0:[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c427fff9bb0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c427fff9bc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c427fff9bd0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c427fff9be0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\n  0x0c427fff9bf0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd\r\nShadow byte legend (one shadow byte represents 8 application bytes):\r\n  Addressable:           00\r\n  Partially addressable: 01 02 03 04 05 06 07 \r\n  Heap left redzone:       fa\r\n  Heap right redzone:      fb\r\n  Freed heap region:       fd\r\n  Stack left redzone:      f1\r\n  Stack mid redzone:       f2\r\n  Stack right redzone:     f3\r\n  Stack partial redzone:   f4\r\n  Stack after return:      f5\r\n  Stack use after scope:   f8\r\n  Global redzone:          f9\r\n  Global init order:       f6\r\n  Poisoned by user:        f7\r\n  Container overflow:      fc\r\n  Array cookie:            ac\r\n  Intra object redzone:    bb\r\n  ASan internal:           fe\r\n  Left alloca redzone:     ca\r\n  Right alloca redzone:    cb\r\n==4026==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n0.631<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Credit:<\/strong><br \/>\nThis bug was discovered by Agostino Sarubbo of Gentoo.<\/p>\n<p><strong>CVE:<\/strong><br \/>\nCVE-2017-8846<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00233-lrzip-UAF-read_stream\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00233-lrzip-UAF-read_stream<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-03-24: bug discovered and reported to upstream<br \/>\n2017-05-07: blog post about the issue<br \/>\n2017-05-08: CVE assigned<\/p>\n<p><strong>Note:<\/strong><br \/>\nThis bug was found with <a href=\"http:\/\/lcamtuf.coredump.cx\/afl\">American Fuzzy Lop<\/a>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"QAyQL25QY6\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/05\/07\/lrzip-use-after-free-in-read_stream-stream-c\/\">lrzip: use-after-free in read_stream (stream.c)<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/blogs.gentoo.org\/ago\/2017\/05\/07\/lrzip-use-after-free-in-read_stream-stream-c\/embed\/#?secret=QAyQL25QY6\" data-secret=\"QAyQL25QY6\" width=\"600\" height=\"338\" title=\"&#8220;lrzip: use-after-free in read_stream (stream.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: lrzip is a compression utility that excels at compressing large files. The complete ASan output of the issue: # lrzip -t $FILE ==4026==ERROR: AddressSanitizer: heap-use-after-free on address 0x62100000dd00 at pc 0x0000004bccc5 bp 0x7ffcf3b4d9f0 sp 0x7ffcf3b4d1a0 READ of size 1 &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/05\/07\/lrzip-use-after-free-in-read_stream-stream-c\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":140,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[12,10],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2EaBc-st","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1765"}],"collection":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/users\/140"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/comments?post=1765"}],"version-history":[{"count":4,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1765\/revisions"}],"predecessor-version":[{"id":1799,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1765\/revisions\/1799"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}