From e64a961e9c5e94e643896e4b68b85bd5b4c27470 Mon Sep 17 00:00:00 2001 From: Li Zhou Date: Fri, 24 Apr 2015 15:36:36 +0800 Subject: libarchive: Security Advisory - libarchive - CVE-2015-2304 libarchive: Updated libarchive packages fix security vulnerability Alexander Cherepanov discovered that bsdcpio, an implementation of the "cpio" program part of the libarchive project, is susceptible to a directory traversal vulnerability via absolute paths. Signed-off-by: Li Zhou Signed-off-by: Richard Purdie --- ...IVE_EXTRACT_SECURE_NOABSOLUTEPATHS-option.patch | 151 +++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 meta/recipes-extended/libarchive/libarchive/0001-Add-ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS-option.patch (limited to 'meta/recipes-extended/libarchive/libarchive') diff --git a/meta/recipes-extended/libarchive/libarchive/0001-Add-ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS-option.patch b/meta/recipes-extended/libarchive/libarchive/0001-Add-ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS-option.patch new file mode 100644 index 0000000000..4ca779c40f --- /dev/null +++ b/meta/recipes-extended/libarchive/libarchive/0001-Add-ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS-option.patch @@ -0,0 +1,151 @@ +From 59357157706d47c365b2227739e17daba3607526 Mon Sep 17 00:00:00 2001 +From: Alessandro Ghedini +Date: Sun, 1 Mar 2015 12:07:45 +0100 +Subject: [PATCH] Add ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS option + +This fixes a directory traversal in the cpio tool. + + +Upstream-Status: backport + +Signed-off-by: Li Zhou +--- + cpio/bsdcpio.1 | 3 ++- + cpio/cpio.c | 2 ++ + libarchive/archive.h | 2 ++ + libarchive/archive_write_disk.3 | 3 +++ + libarchive/archive_write_disk_posix.c | 14 +++++++++++--- + libarchive/test/test_write_disk_secure.c | 23 +++++++++++++++++++++++ + 6 files changed, 43 insertions(+), 4 deletions(-) + +diff --git a/cpio/bsdcpio.1 b/cpio/bsdcpio.1 +index f966aa0..e52546e 100644 +--- a/cpio/bsdcpio.1 ++++ b/cpio/bsdcpio.1 +@@ -156,7 +156,8 @@ See above for description. + .It Fl Fl insecure + (i and p mode only) + Disable security checks during extraction or copying. +-This allows extraction via symbolic links and path names containing ++This allows extraction via symbolic links, absolute paths, ++and path names containing + .Sq .. + in the name. + .It Fl J , Fl Fl xz +diff --git a/cpio/cpio.c b/cpio/cpio.c +index 0acde11..b267e9b 100644 +--- a/cpio/cpio.c ++++ b/cpio/cpio.c +@@ -171,6 +171,7 @@ main(int argc, char *argv[]) + cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER; + cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS; + cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT; ++ cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS; + cpio->extract_flags |= ARCHIVE_EXTRACT_PERM; + cpio->extract_flags |= ARCHIVE_EXTRACT_FFLAGS; + cpio->extract_flags |= ARCHIVE_EXTRACT_ACL; +@@ -256,6 +257,7 @@ main(int argc, char *argv[]) + case OPTION_INSECURE: + cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS; + cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT; ++ cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS; + break; + case 'L': /* GNU cpio */ + cpio->option_follow_links = 1; +diff --git a/libarchive/archive.h b/libarchive/archive.h +index 1f0fc38..ef635ac 100644 +--- a/libarchive/archive.h ++++ b/libarchive/archive.h +@@ -649,6 +649,8 @@ __LA_DECL int archive_read_set_passphrase_callback(struct archive *, + /* Default: Do not use HFS+ compression if it was not compressed. */ + /* This has no effect except on Mac OS v10.6 or later. */ + #define ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED (0x8000) ++/* Default: Do not reject entries with absolute paths */ ++#define ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS (0x10000) + + __LA_DECL int archive_read_extract(struct archive *, struct archive_entry *, + int flags); +diff --git a/libarchive/archive_write_disk.3 b/libarchive/archive_write_disk.3 +index fa925cc..a2e7afa 100644 +--- a/libarchive/archive_write_disk.3 ++++ b/libarchive/archive_write_disk.3 +@@ -177,6 +177,9 @@ The default is to not refuse such paths. + Note that paths ending in + .Pa .. + always cause an error, regardless of this flag. ++.It Cm ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS ++Refuse to extract an absolute path. ++The default is to not refuse such paths. + .It Cm ARCHIVE_EXTRACT_SPARSE + Scan data for blocks of NUL bytes and try to recreate them with holes. + This results in sparse files, independent of whether the archive format +diff --git a/libarchive/archive_write_disk_posix.c b/libarchive/archive_write_disk_posix.c +index ab3bdac..c1290eb 100644 +--- a/libarchive/archive_write_disk_posix.c ++++ b/libarchive/archive_write_disk_posix.c +@@ -2509,8 +2509,9 @@ cleanup_pathname_win(struct archive_write_disk *a) + /* + * Canonicalize the pathname. In particular, this strips duplicate + * '/' characters, '.' elements, and trailing '/'. It also raises an +- * error for an empty path, a trailing '..' or (if _SECURE_NODOTDOT is +- * set) any '..' in the path. ++ * error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is ++ * set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS ++ * is set) if the path is absolute. + */ + static int + cleanup_pathname(struct archive_write_disk *a) +@@ -2529,8 +2530,15 @@ cleanup_pathname(struct archive_write_disk *a) + cleanup_pathname_win(a); + #endif + /* Skip leading '/'. */ +- if (*src == '/') ++ if (*src == '/') { ++ if (a->flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { ++ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, ++ "Path is absolute"); ++ return (ARCHIVE_FAILED); ++ } ++ + separator = *src++; ++ } + + /* Scan the pathname one element at a time. */ + for (;;) { +diff --git a/libarchive/test/test_write_disk_secure.c b/libarchive/test/test_write_disk_secure.c +index 31c5bfd..2c94206 100644 +--- a/libarchive/test/test_write_disk_secure.c ++++ b/libarchive/test/test_write_disk_secure.c +@@ -178,6 +178,29 @@ DEFINE_TEST(test_write_disk_secure) + assert(S_ISDIR(st.st_mode)); + archive_entry_free(ae); + ++ /* ++ * Without security checks, we should be able to ++ * extract an absolute path. ++ */ ++ assert((ae = archive_entry_new()) != NULL); ++ archive_entry_copy_pathname(ae, "/tmp/libarchive_test-test_write_disk_secure-absolute_path.tmp"); ++ archive_entry_set_mode(ae, S_IFREG | 0777); ++ assert(0 == archive_write_header(a, ae)); ++ assert(0 == archive_write_finish_entry(a)); ++ assertFileExists("/tmp/libarchive_test-test_write_disk_secure-absolute_path.tmp"); ++ assert(0 == unlink("/tmp/libarchive_test-test_write_disk_secure-absolute_path.tmp")); ++ ++ /* But with security checks enabled, this should fail. */ ++ assert(archive_entry_clear(ae) != NULL); ++ archive_entry_copy_pathname(ae, "/tmp/libarchive_test-test_write_disk_secure-absolute_path.tmp"); ++ archive_entry_set_mode(ae, S_IFREG | 0777); ++ archive_write_disk_set_options(a, ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS); ++ failure("Extracting an absolute path should fail here."); ++ assertEqualInt(ARCHIVE_FAILED, archive_write_header(a, ae)); ++ archive_entry_free(ae); ++ assert(0 == archive_write_finish_entry(a)); ++ assertFileNotExists("/tmp/libarchive_test-test_write_disk_secure-absolute_path.tmp"); ++ + assertEqualInt(ARCHIVE_OK, archive_write_free(a)); + + /* Test the entries on disk. */ +-- +1.7.9.5 + -- cgit 1.2.3-korg