diff options
Diffstat (limited to 'meta/recipes-extended/libarchive/libarchive/CVE-2018-1000879.patch')
| -rw-r--r-- | meta/recipes-extended/libarchive/libarchive/CVE-2018-1000879.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/meta/recipes-extended/libarchive/libarchive/CVE-2018-1000879.patch b/meta/recipes-extended/libarchive/libarchive/CVE-2018-1000879.patch new file mode 100644 index 0000000000..9f25932a1a --- /dev/null +++ b/meta/recipes-extended/libarchive/libarchive/CVE-2018-1000879.patch @@ -0,0 +1,50 @@ +CVE: CVE-2018-1000879 +Upstream-Status: Backport +Signed-off-by: Ross Burton <ross.burton@intel.com> + +From 15bf44fd2c1ad0e3fd87048b3fcc90c4dcff1175 Mon Sep 17 00:00:00 2001 +From: Daniel Axtens <dja@axtens.net> +Date: Tue, 4 Dec 2018 14:29:42 +1100 +Subject: [PATCH] Skip 0-length ACL fields + +Currently, it is possible to create an archive that crashes bsdtar +with a malformed ACL: + +Program received signal SIGSEGV, Segmentation fault. +archive_acl_from_text_l (acl=<optimised out>, text=0x7e2e92 "", want_type=<optimised out>, sc=<optimised out>) at libarchive/archive_acl.c:1726 +1726 switch (*s) { +(gdb) p n +$1 = 1 +(gdb) p field[n] +$2 = {start = 0x0, end = 0x0} + +Stop this by checking that the length is not zero before beginning +the switch statement. + +I am pretty sure this is the bug mentioned in the qsym paper [1], +and I was able to replicate it with a qsym + AFL + afl-rb setup. + +[1] https://www.usenix.org/conference/usenixsecurity18/presentation/yun +--- + libarchive/archive_acl.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/libarchive/archive_acl.c b/libarchive/archive_acl.c +index 512beee1..7beeee86 100644 +--- a/libarchive/archive_acl.c ++++ b/libarchive/archive_acl.c +@@ -1723,6 +1723,11 @@ archive_acl_from_text_l(struct archive_acl *acl, const char *text, + st = field[n].start + 1; + len = field[n].end - field[n].start; + ++ if (len == 0) { ++ ret = ARCHIVE_WARN; ++ continue; ++ } ++ + switch (*s) { + case 'u': + if (len == 1 || (len == 4 +-- +2.20.0 + |