Linux Kernel 3.3.x <= 3.3.4 Buffer overflow in HFS plus filesystem

Credit: Timo Warns
Risk: High
Local: Yes
Remote: No

CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

PRE-CERT Security Advisory ========================== * Advisory: PRE-SA-2012-03 * Released on: 10 May 2012 * Affected product: Linux Kernel 3.3.x <= 3.3.4 2.6.x <= * Impact: code execution / privilege escalation * Origin: HFS plus file system * Credit: Timo Warns (PRESENSE Technologies GmbH) * CVE Identifier: CVE-2012-2319 Summary ------- The Linux kernel contains a vulnerability in the driver for HFS plus file systems that may be exploited for code execution or privilege escalation. A specially-crafted HFS plus filesystem can cause a buffer overflow via the memcpy() call of hfs_bnode_read() (in fs/hfsplus/bnode.c). The functions hfsplus_rename_cat() (in fs/hfsplus/catalog.c) and hfsplus_readdir() (in fs/hfsplus/dir.c) call hfs_bnode_read() with values that result in a memcpy() call with a fixed-length destination buffer and both, a source buffer and length, that are read from the filesystem without sufficient validation. The buffer overflows were previously fixed in the HFS filesystem driver and have been assigned CVE-2009-4020 (commit ec81aecb29668ad71f699f4e7b96ec46691895b6 [1]). Commit 6f24f892871acc47b40dd594c63606a17c714f77 ("hfsplus: fix a potential buffer overflow") [2] also fixes the issue in the HFS plus filesystem driver. Workaround ---------- Compile and use a kernel that does not support the HFS plus file system. The corresponding configuration key is CONFIG_HFSPLUS_FS. Solution -------- A patch is available at The issue has been fixed in Linux 3.3.5. References ---------- [1] [2] When further information becomes available, this advisory will be updated. The most recent version of this advisory is available at: Contact -------- PRE-CERT can be reached under precert () pre-secure de For PGP key information, refer to


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