diff --git a/backport-CVE-2024-20696.patch b/backport-CVE-2024-20696.patch new file mode 100644 index 0000000000000000000000000000000000000000..5a0da817b8177e66445768ea62025e4cdd9e4415 --- /dev/null +++ b/backport-CVE-2024-20696.patch @@ -0,0 +1,119 @@ +From eac15e252010c1189a5c0f461364dbe2cd2a68b1 Mon Sep 17 00:00:00 2001 +From: "Dustin L. Howett" +Date: Thu, 9 May 2024 18:59:17 -0500 +Subject: [PATCH] rar4 reader: protect copy_from_lzss_window_to_unp() (#2172) + +copy_from_lzss_window_to_unp unnecessarily took an `int` parameter where +both of its callers were holding a `size_t`. + +A lzss opcode chain could be constructed that resulted in a negative +copy length, which when passed into memcpy would result in a very, very +large positive number. + +Switching copy_from_lzss_window_to_unp to take a `size_t` allows it to +properly bounds-check length. + +In addition, this patch also ensures that `length` is not itself larger +than the destination buffer. + +Security: CVE-2024-20696 + +Reference:https://github.com/libarchive/libarchive/commit/eac15e252010c1189a5c0f461364dbe2cd2a68b1 +Conflict:copy_from_lzss_window_to_unp() -> copy_from_lzss_window();adapt context +--- + libarchive/archive_read_support_format_rar.c | 28 +++++++++++++------- + 1 file changed, 18 insertions(+), 10 deletions(-) + +diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c +index c2666b2..512f5a6 100644 +--- a/libarchive/archive_read_support_format_rar.c ++++ b/libarchive/archive_read_support_format_rar.c +@@ -358,7 +358,7 @@ static int make_table_recurse(struct archive_read *, struct huffman_code *, int, + struct huffman_table_entry *, int, int); + static int64_t expand(struct archive_read *, int64_t); + static int copy_from_lzss_window(struct archive_read *, const void **, +- int64_t, int); ++ int64_t, size_t); + static const void *rar_read_ahead(struct archive_read *, size_t, ssize_t *); + + /* +@@ -1936,7 +1936,7 @@ read_data_compressed(struct archive_read *a, const void **buff, size_t *size, + bs = rar->unp_buffer_size - rar->unp_offset; + else + bs = (size_t)rar->bytes_uncopied; +- ret = copy_from_lzss_window(a, buff, rar->offset, (int)bs); ++ ret = copy_from_lzss_window(a, buff, rar->offset, bs); + if (ret != ARCHIVE_OK) + return (ret); + rar->offset += bs; +@@ -2065,7 +2065,7 @@ read_data_compressed(struct archive_read *a, const void **buff, size_t *size, + bs = rar->unp_buffer_size - rar->unp_offset; + else + bs = (size_t)rar->bytes_uncopied; +- ret = copy_from_lzss_window(a, buff, rar->offset, (int)bs); ++ ret = copy_from_lzss_window(a, buff, rar->offset, bs); + if (ret != ARCHIVE_OK) + return (ret); + rar->offset += bs; +@@ -2923,11 +2923,16 @@ bad_data: + + static int + copy_from_lzss_window(struct archive_read *a, const void **buffer, +- int64_t startpos, int length) ++ int64_t startpos, size_t length) + { + int windowoffs, firstpart; + struct rar *rar = (struct rar *)(a->format->data); + ++ if (length > rar->unp_buffer_size) ++ { ++ goto fatal; ++ } ++ + if (!rar->unp_buffer) + { + if ((rar->unp_buffer = malloc(rar->unp_buffer_size)) == NULL) +@@ -2939,17 +2944,17 @@ copy_from_lzss_window(struct archive_read *a, const void **buffer, + } + + windowoffs = lzss_offset_for_position(&rar->lzss, startpos); +- if(windowoffs + length <= lzss_size(&rar->lzss)) { ++ if(windowoffs + length <= (size_t)lzss_size(&rar->lzss)) { + memcpy(&rar->unp_buffer[rar->unp_offset], &rar->lzss.window[windowoffs], + length); +- } else if (length <= lzss_size(&rar->lzss)) { ++ } else if (length <= (size_t)lzss_size(&rar->lzss)) { + firstpart = lzss_size(&rar->lzss) - windowoffs; + if (firstpart < 0) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + "Bad RAR file data"); + return (ARCHIVE_FATAL); + } +- if (firstpart < length) { ++ if ((size_t)firstpart < length) { + memcpy(&rar->unp_buffer[rar->unp_offset], + &rar->lzss.window[windowoffs], firstpart); + memcpy(&rar->unp_buffer[rar->unp_offset + firstpart], +@@ -2959,9 +2964,7 @@ copy_from_lzss_window(struct archive_read *a, const void **buffer, + &rar->lzss.window[windowoffs], length); + } + } else { +- archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, +- "Bad RAR file data"); +- return (ARCHIVE_FATAL); ++ goto fatal; + } + rar->unp_offset += length; + if (rar->unp_offset >= rar->unp_buffer_size) +@@ -2969,6 +2972,11 @@ copy_from_lzss_window(struct archive_read *a, const void **buffer, + else + *buffer = NULL; + return (ARCHIVE_OK); ++ ++fatal: ++ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, ++ "Bad RAR file data"); ++ return (ARCHIVE_FATAL); + } + + static const void * diff --git a/libarchive.spec b/libarchive.spec index c03f1263c686d75746ebc4be331397d7c680063e..8b860ccd9cecdbc8c83d8d72f27f708e6b97ea0e 100644 --- a/libarchive.spec +++ b/libarchive.spec @@ -2,7 +2,7 @@ Name: libarchive Version: 3.5.2 -Release: 6 +Release: 7 Summary: Multi-format archive and compression library License: BSD @@ -19,6 +19,7 @@ Patch6002: backport-0002-CVE-2021-36976.patch Patch6003: backport-CVE-2021-31566.patch Patch6004: backport-CVE-2022-26280.patch Patch6005: backport-CVE-2022-36227.patch +Patch6006: backport-CVE-2024-20696.patch Patch9000: libarchive-uninitialized-value.patch @@ -193,6 +194,12 @@ run_testsuite %{_bindir}/bsdcat %changelog +* Thu Jun 06 2024 lingsheng - 3.5.2-7 +- Type:CVE +- ID:CVE-2024-20696 +- SUG:NA +- DESC:fix CVE-2024-20696 + * Thu Mar 02 2023 zhangpan - 3.5.2-6 - fix CVE-2021-36976 patch