From 8b383ee2a0d21144258346ad39006fc499d04b4f Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Tue, 1 Nov 2022 15:23:17 +0100 Subject: [PATCH] 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 --- ...VE-2022-30065-awk-fix-use-after-free.patch | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch 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 00000000000..7dcb9dff3f6 --- /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 +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 +Signed-off-by: Denys Vlasenko +--- + 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