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>
(cherry picked from commit 2a00f15354084cee6b2183fcdbfdfc7826c365da)

Signed-off-by: Riyaz Khan <Riyaz.Khan@kpit.com>
Signed-off-by: Riyaz Khan <rak3033@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

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 (file)
index 0000000..b2f40f3
--- /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_1.32.bb b/meta/recipes-extended/tar/tar_1.32.bb
index db1540dbd6928d33dc7e32193b0aee0e51626f65..1246f012569b9d047eef0ab668ec01e8fa4d5d35 100644 (file)
--- a/meta/recipes-extended/tar/tar_1.32.bb
+++ b/meta/recipes-extended/tar/tar_1.32.bb
@@ -9,6 +9,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504"
 SRC_URI = "${GNU_MIRROR}/tar/tar-${PV}.tar.bz2 \
            file://musl_dirent.patch \
            file://CVE-2021-20193.patch \
+           file://CVE-2022-48303.patch \
 "
 
 SRC_URI[md5sum] = "17917356fff5cb4bd3cd5a6c3e727b05"