CVE: CVE-2018-1000878 Upstream-Status: Backport Signed-off-by: Ross Burton From bfcfe6f04ed20db2504db8a254d1f40a1d84eb28 Mon Sep 17 00:00:00 2001 From: Daniel Axtens Date: Tue, 4 Dec 2018 00:55:22 +1100 Subject: [PATCH] rar: file split across multi-part archives must match Fuzzing uncovered some UAF and memory overrun bugs where a file in a single file archive reported that it was split across multiple volumes. This was caused by ppmd7 operations calling rar_br_fillup. This would invoke rar_read_ahead, which would in some situations invoke archive_read_format_rar_read_header. That would check the new file name against the old file name, and if they didn't match up it would free the ppmd7 buffer and allocate a new one. However, because the ppmd7 decoder wasn't actually done with the buffer, it would continue to used the freed buffer. Both reads and writes to the freed region can be observed. This is quite tricky to solve: once the buffer has been freed it is too late, as the ppmd7 decoder functions almost universally assume success - there's no way for ppmd_read to signal error, nor are there good ways for functions like Range_Normalise to propagate them. So we can't detect after the fact that we're in an invalid state - e.g. by checking rar->cursor, we have to prevent ourselves from ever ending up there. So, when we are in the dangerous part or rar_read_ahead that assumes a valid split, we set a flag force read_header to either go down the path for split files or bail. This means that the ppmd7 decoder keeps a valid buffer and just runs out of data. Found with a combination of AFL, afl-rb and qsym. --- libarchive/archive_read_support_format_rar.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c index 6f419c27..a8cc5c94 100644 --- a/libarchive/archive_read_support_format_rar.c +++ b/libarchive/archive_read_support_format_rar.c @@ -258,6 +258,7 @@ struct rar struct data_block_offsets *dbo; unsigned int cursor; unsigned int nodes; + char filename_must_match; /* LZSS members */ struct huffman_code maincode; @@ -1560,6 +1561,12 @@ read_header(struct archive_read *a, struct archive_entry *entry, } return ret; } + else if (rar->filename_must_match) + { + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Mismatch of file parts split across multi-volume archive"); + return (ARCHIVE_FATAL); + } rar->filename_save = (char*)realloc(rar->filename_save, filename_size + 1); @@ -2933,12 +2940,14 @@ rar_read_ahead(struct archive_read *a, size_t min, ssize_t *avail) else if (*avail == 0 && rar->main_flags & MHD_VOLUME && rar->file_flags & FHD_SPLIT_AFTER) { + rar->filename_must_match = 1; ret = archive_read_format_rar_read_header(a, a->entry); if (ret == (ARCHIVE_EOF)) { rar->has_endarc_header = 1; ret = archive_read_format_rar_read_header(a, a->entry); } + rar->filename_must_match = 0; if (ret != (ARCHIVE_OK)) return NULL; return rar_read_ahead(a, min, avail); -- 2.20.0