| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49762: ntfs: check overflow when iterating ATTR_RECORDs |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ntfs: check overflow when iterating ATTR_RECORDs |
| |
| Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). |
| Because the ATTR_RECORDs are next to each other, kernel can get the next |
| ATTR_RECORD from end address of current ATTR_RECORD, through current |
| ATTR_RECORD length field. |
| |
| The problem is that during iteration, when kernel calculates the end |
| address of current ATTR_RECORD, kernel may trigger an integer overflow bug |
| in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`. This |
| may wrap, leading to a forever iteration on 32bit systems. |
| |
| This patch solves it by adding some checks on calculating end address |
| of current ATTR_RECORD during iteration. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49762 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.334 with commit 5559eb5809353a83a40a1e4e7f066431c7b83020 |
| Fixed in 4.14.300 with commit 86f36de14dce5802856bb7a5921d74439db00b64 |
| Fixed in 4.19.267 with commit 45683723f6b53e39e8a4cec0894e61fd6ec71989 |
| Fixed in 5.4.225 with commit b612f924f296408d7d02fb4cd01218afd4ed7184 |
| Fixed in 5.10.156 with commit 957732a09c3828267c2819d31c425aa793dd475b |
| Fixed in 5.15.80 with commit b63ddb3ba61e2d3539f87e095c881e552bc45dab |
| Fixed in 6.0.10 with commit 785b2af9654b8beac55644e36da0085c5d776361 |
| Fixed in 6.1 with commit 63095f4f3af59322bea984a6ae44337439348fe0 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49762 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/ntfs/attrib.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/5559eb5809353a83a40a1e4e7f066431c7b83020 |
| https://git.kernel.org/stable/c/86f36de14dce5802856bb7a5921d74439db00b64 |
| https://git.kernel.org/stable/c/45683723f6b53e39e8a4cec0894e61fd6ec71989 |
| https://git.kernel.org/stable/c/b612f924f296408d7d02fb4cd01218afd4ed7184 |
| https://git.kernel.org/stable/c/957732a09c3828267c2819d31c425aa793dd475b |
| https://git.kernel.org/stable/c/b63ddb3ba61e2d3539f87e095c881e552bc45dab |
| https://git.kernel.org/stable/c/785b2af9654b8beac55644e36da0085c5d776361 |
| https://git.kernel.org/stable/c/63095f4f3af59322bea984a6ae44337439348fe0 |
