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| author | Hauke Mehrtens <hauke@hauke-m.de> | 2022-11-01 15:23:17 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2022-11-05 22:43:45 +0100 |
| commit | 13bd217821e766110298498d0b73c4394e3330bd (patch) | |
| tree | a622ff69ca8403470b31eed2592430ffa5befc36 | |
| parent | fe5cd3c9d97caf8c201c0c9953cfd52bec071108 (diff) | |
| download | upstream-13bd217821e766110298498d0b73c4394e3330bd.tar.gz upstream-13bd217821e766110298498d0b73c4394e3330bd.tar.bz2 upstream-13bd217821e766110298498d0b73c4394e3330bd.zip | |
busybox: awk: fix use after free (CVE-2022-30065)
This backports a commit which fixes a use after free bug in awk.
CVE-2022-30065 description:
A use-after-free in Busybox 1.35-x's awk applet leads to denial of
service and possibly code execution when processing a crafted awk
pattern in the copyvar function.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 8b383ee2a0d21144258346ad39006fc499d04b4f)
| -rw-r--r-- | package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch b/package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch new file mode 100644 index 0000000000..7dcb9dff3f --- /dev/null +++ b/package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch @@ -0,0 +1,42 @@ +From e63d7cdfdac78c6fd27e9e63150335767592b85e Mon Sep 17 00:00:00 2001 +From: Natanael Copa <ncopa@alpinelinux.org> +Date: Fri, 17 Jun 2022 17:45:34 +0200 +Subject: awk: fix use after free (CVE-2022-30065) + +fixes https://bugs.busybox.net/show_bug.cgi?id=14781 + +function old new delta +evaluate 3343 3357 +14 + +Signed-off-by: Natanael Copa <ncopa@alpinelinux.org> +Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> +--- + editors/awk.c | 3 +++ + testsuite/awk.tests | 6 ++++++ + 2 files changed, 9 insertions(+) + +--- a/editors/awk.c ++++ b/editors/awk.c +@@ -3114,6 +3114,9 @@ static var *evaluate(node *op, var *res) + + case XC( OC_MOVE ): + debug_printf_eval("MOVE\n"); ++ /* make sure that we never return a temp var */ ++ if (L.v == TMPVAR0) ++ L.v = res; + /* if source is a temporary string, jusk relink it to dest */ + if (R.v == TMPVAR1 + && !(R.v->type & VF_NUMBER) +--- a/testsuite/awk.tests ++++ b/testsuite/awk.tests +@@ -469,4 +469,10 @@ testing 'awk printf %% prints one %' \ + "%\n" \ + '' '' + ++testing 'awk assign while test' \ ++ "awk '\$1==\$1=\"foo\" {print \$1}'" \ ++ "foo\n" \ ++ "" \ ++ "foo" ++ + exit $FAILCOUNT |