{"id":1157,"date":"2017-02-01T11:07:44","date_gmt":"2017-02-01T09:07:44","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1157"},"modified":"2017-02-02T13:46:55","modified_gmt":"2017-02-02T11:46:55","slug":"mp3splt-null-pointer-dereference-in-free_options-options_manager-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/mp3splt-null-pointer-dereference-in-free_options-options_manager-c\/","title":{"rendered":"mp3splt: NULL pointer dereference in free_options (options_manager.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/mp3splt.sourceforge.net\">mp3splt<\/a> is a command line utility to split mp3 and ogg files without decoding.<\/p>\n<p>A fuzz on it discovered a NULL pointer access.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># mp3splt -P -f -t 0.1 -a $FILE\r\n==3026==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000041ea65 bp 0x331bdacc2c238b55 sp 0x7fff34d2c400 T0)                                                                                                                                         \r\n    #0 0x41ea64 in atomic_compare_exchange_strong \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/..\/sanitizer_common\/sanitizer_atomic_clang.h:81                                                          \r\n    #1 0x41ea64 in __asan::Allocator::AtomicallySetQuarantineFlagIfAllocated(__asan::AsanChunk*, void*, __sanitizer::BufferedStackTrace*) \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/asan_allocator.cc:468                         \r\n    #2 0x41ea64 in __asan::Allocator::Deallocate(void*, unsigned long, __sanitizer::BufferedStackTrace*, __asan::AllocType) \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/asan_allocator.cc:522                                       \r\n    #3 0x41ea64 in __asan::asan_free(void*, __sanitizer::BufferedStackTrace*, __asan::AllocType) \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/asan_allocator.cc:725                                                                  \r\n    #4 0x4d374c in free \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/asan_malloc_linux.cc:50                                                                                                                                         \r\n    #5 0x50db0e in free_options \/tmp\/portage\/media-sound\/mp3splt-2.6.2\/work\/mp3splt-2.6.2\/src\/options_manager.c:61:9                                                                                                                                                           \r\n    #6 0x515623 in free_main_struct \/tmp\/portage\/media-sound\/mp3splt-2.6.2\/work\/mp3splt-2.6.2\/src\/data_manager.c:74:7                                                                                                                                                          \r\n    #7 0x50ffa5 in process_confirmation_error \/tmp\/portage\/media-sound\/mp3splt-2.6.2\/work\/mp3splt-2.6.2\/src\/print_utils.c:266:7                                                                                                                                                \r\n    #8 0x51df29 in main \/tmp\/portage\/media-sound\/mp3splt-2.6.2\/work\/mp3splt-2.6.2\/src\/mp3splt.c:873:9                                                                                                                                                                          \r\n    #9 0x7f8a687f861f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289                                                                                                                                                        \r\n    #10 0x41ad08 in _init (\/usr\/bin\/mp3splt+0x41ad08)                                                                                                                                                                                                                          \r\n                                                                                                                                                                                                                                                                               \r\nAddressSanitizer can not provide additional info.                                                                                                                                                                                                                              \r\nSUMMARY: AddressSanitizer: SEGV \/tmp\/portage\/sys-devel\/llvm-3.9.0-r1\/work\/llvm-3.9.0.src\/projects\/compiler-rt\/lib\/asan\/..\/sanitizer_common\/sanitizer_atomic_clang.h:81 in atomic_compare_exchange_strong                                          \r\n==3026==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n0.9.2<\/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-2017-5851<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00127-mp3splt-nullptr-free_options\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00127-mp3splt-nullptr-free_options<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-01-01: privately poked upstream about<br \/>\n2017-02-01: blog post about the issue<br \/>\n2017-02-02: 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><br \/>\nhttps:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/mp3splt-null-pointer-dereference-in-free_options-options_manager-c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: mp3splt is a command line utility to split mp3 and ogg files without decoding. A fuzz on it discovered a NULL pointer access. The complete ASan output: # mp3splt -P -f -t 0.1 -a $FILE ==3026==ERROR: AddressSanitizer: SEGV on &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/02\/01\/mp3splt-null-pointer-dereference-in-free_options-options_manager-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-iF","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1157"}],"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=1157"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1157\/revisions"}],"predecessor-version":[{"id":1258,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1157\/revisions\/1258"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}