17ba24bac1
Add backported patches for the following four security issues in libarchive. There is no new release yet including these patches. - CVE-2018-1000877 (https://nvd.nist.gov/vuln/detail/CVE-2018-1000877) "libarchive version commit 416694915449219d505531b1096384f3237dd6cc onwards (release v3.1.0 onwards) contains a CWE-415: Double Free vulnerability in RAR decoder - libarchive/archive_read_support_format_rar.c, parse_codes(), realloc(rar->lzss.window, new_size) with new_size = 0 that can result in Crash/DoS. This attack appear to be exploitable via the victim must open a specially crafted RAR archive." - CVE-2018-1000878 (https://nvd.nist.gov/vuln/detail/CVE-2018-1000878) "libarchive version commit 416694915449219d505531b1096384f3237dd6cc onwards (release v3.1.0 onwards) contains a CWE-416: Use After Free vulnerability in RAR decoder - libarchive/archive_read_support_format_rar.c that can result in Crash/DoS - it is unknown if RCE is possible. This attack appear to be exploitable via the victim must open a specially crafted RAR archive." - CVE-2018-1000879 (https://nvd.nist.gov/vuln/detail/CVE-2018-1000879) "libarchive version commit 379867ecb330b3a952fb7bfa7bffb7bbd5547205 onwards (release v3.3.0 onwards) contains a CWE-476: NULL Pointer Dereference vulnerability in ACL parser - libarchive/archive_acl.c, archive_acl_from_text_l() that can result in Crash/DoS. This attack appear to be exploitable via the victim must open a specially crafted archive file." - CVE-2018-1000880 (https://nvd.nist.gov/vuln/detail/CVE-2018-1000880) "libarchive version commit 9693801580c0cf7c70e862d305270a16b52826a7 onwards (release v3.2.0 onwards) contains a CWE-20: Improper Input Validation vulnerability in WARC parser - libarchive/archive_read_support_format_warc.c, _warc_read() that can result in DoS - quasi-infinite run time and disk usage from tiny file. This attack appear to be exploitable via the victim must open a specially crafted WARC file." Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
53 lines
1.5 KiB
Diff
53 lines
1.5 KiB
Diff
From 15bf44fd2c1ad0e3fd87048b3fcc90c4dcff1175 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 4 Dec 2018 14:29:42 +1100
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Subject: [PATCH] Skip 0-length ACL fields
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Currently, it is possible to create an archive that crashes bsdtar
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with a malformed ACL:
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Program received signal SIGSEGV, Segmentation fault.
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archive_acl_from_text_l (acl=<optimised out>, text=0x7e2e92 "", want_type=<optimised out>, sc=<optimised out>) at libarchive/archive_acl.c:1726
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1726 switch (*s) {
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(gdb) p n
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$1 = 1
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(gdb) p field[n]
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$2 = {start = 0x0, end = 0x0}
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Stop this by checking that the length is not zero before beginning
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the switch statement.
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I am pretty sure this is the bug mentioned in the qsym paper [1],
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and I was able to replicate it with a qsym + AFL + afl-rb setup.
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[1] https://www.usenix.org/conference/usenixsecurity18/presentation/yun
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---
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libarchive/archive_acl.c | 5 +++++
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1 file changed, 5 insertions(+)
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[for import into Buildroot]
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Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
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Upstream-status: backport
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CVE-2018-1000879
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diff --git a/libarchive/archive_acl.c b/libarchive/archive_acl.c
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index 512beee1..7beeee86 100644
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--- a/libarchive/archive_acl.c
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+++ b/libarchive/archive_acl.c
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@@ -1723,6 +1723,11 @@ archive_acl_from_text_l(struct archive_acl *acl, const char *text,
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st = field[n].start + 1;
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len = field[n].end - field[n].start;
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+ if (len == 0) {
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+ ret = ARCHIVE_WARN;
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+ continue;
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+ }
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+
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switch (*s) {
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case 'u':
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if (len == 1 || (len == 4
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--
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2.19.2
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