tar: CVE-2022-48303

Fixes CVE-2022-48303 by checking Base-256 encoding is at least
2 bytes long. GNU Tar through 1.34 has a one-byte out-of-bounds
read that results in use of uninitialized memory for a conditional
jump. Exploitation to change the flow of control has not been
demonstrated. The issue occurs in from_header in list.c via a
V7 archive in which mtime has approximately 11 whitespace characters.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2022-48303

Upstream patch:
https://savannah.gnu.org/bugs/?62387
https://git.savannah.gnu.org/cgit/tar.git/patch/src/list.c?id=3da78400eafcccb97e2f2fd4b227ea40d794ede8

(From OE-Core rev: 231360a55bf1b96d6bb1cf94820b08788677c58b)

Signed-off-by: Rodolfo Quesada Zumbado <rodolfo.zumbado@windriver.com>
Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 46 insertions, 1 deletions

diff --git a/meta/recipes-extended/tar/tar/CVE-2022-48303.patch b/meta/recipes-extended/tar/tar/CVE-2022-48303.patch
new file mode 100644
index 0000000000..b2f40f3e64
--- /dev/null
+++ b/meta/recipes-extended/tar/tar/CVE-2022-48303.patch
@@ -0,0 +1,43 @@
+From 3da78400eafcccb97e2f2fd4b227ea40d794ede8 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Sat, 11 Feb 2023 11:57:39 +0200
+Subject: Fix boundary checking in base-256 decoder
+
+* src/list.c (from_header): Base-256 encoding is at least 2 bytes
+long.
+
+Upstream-Status: Backport [see reference below]
+CVE: CVE-2022-48303
+
+Reference to upstream patch:
+https://savannah.gnu.org/bugs/?62387
+https://git.savannah.gnu.org/cgit/tar.git/patch/src/list.c?id=3da78400eafcccb97e2f2fd4b227ea40d794ede8
+
+Signed-off-by: Rodolfo Quesada Zumbado <rodolfo.zumbado@windriver.com>
+Signed-off-by: Joe Slater <joe.slater@windriver.com>
+---
+ src/list.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)Signed-off-by: Rodolfo Quesada Zumbado <rodolfo.zumbado@windriver.com>
+
+
+(limited to 'src/list.c')
+
+diff --git a/src/list.c b/src/list.c
+index 9fafc42..86bcfdd 100644
+--- a/src/list.c
++++ b/src/list.c
+@@ -881,8 +881,9 @@ from_header (char const *where0, size_t digs, char const *type,
+          where++;
+        }
+     }
+-  else if (*where == '\200' /* positive base-256 */
+-          || *where == '\377' /* negative base-256 */)
++  else if (where <= lim - 2
++          && (*where == '\200' /* positive base-256 */
++              || *where == '\377' /* negative base-256 */))
+     {
+       /* Parse base-256 output.  A nonnegative number N is
+         represented as (256**DIGS)/2 + N; a negative number -N is
+-- 
+cgit v1.1
+
diff --git a/meta/recipes-extended/tar/tar_1.34.bb b/meta/recipes-extended/tar/tar_1.34.bb
index 7307cd57a2..1ef5fe221e 100644
--- a/meta/recipes-extended/tar/tar_1.34.bb
+++ b/meta/recipes-extended/tar/tar_1.34.bb
@@ -6,7 +6,9 @@ SECTION = "base"
 LICENSE = "GPL-3.0-only"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504"
 
-SRC_URI = "${GNU_MIRROR}/tar/tar-${PV}.tar.bz2"
+SRC_URI = "${GNU_MIRROR}/tar/tar-${PV}.tar.bz2 \
+           file://CVE-2022-48303.patch \
+"
 
 SRC_URI[sha256sum] = "b44cc67f8a1f6b0250b7c860e952b37e8ed932a90bd9b1862a511079255646ff"