mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-11-14 10:55:23 -05:00
c824dedf71
* gnu/packages/backup.scm (libarchive)[source, home-page]: Use HTTPS. [replacement]: New field. (libarchive-3.3.3): New variable. * gnu/packages/patches/libarchive-CVE-2018-1000877.patch, gnu/packages/patches/libarchive-CVE-2018-1000878.patch, gnu/packages/patches/libarchive-CVE-2018-1000880.patch: New files. * gnu/local.mk (dist_patch_DATA): Add them.
86 lines
3.5 KiB
Diff
86 lines
3.5 KiB
Diff
Fix CVE-2018-1000878:
|
|
|
|
https://bugs.launchpad.net/ubuntu/+source/libarchive/+bug/1794909
|
|
https://github.com/libarchive/libarchive/pull/1105
|
|
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000878
|
|
https://security-tracker.debian.org/tracker/CVE-2018-1000878
|
|
|
|
Patch copied from upstream source repository:
|
|
|
|
https://github.com/libarchive/libarchive/commit/bfcfe6f04ed20db2504db8a254d1f40a1d84eb28
|
|
|
|
From bfcfe6f04ed20db2504db8a254d1f40a1d84eb28 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
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);
|
|
--
|
|
2.20.1
|
|
|