smb: client: fix one-byte OOB read in smb2_parse_native_symlink()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.158, 6.12.111, 6.12, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix one-byte OOB read in smb2_parse_native_symlink() When parsing a share-root relative native symlink, memcpy copies smb_target+1 (skipping the leading separator) but uses strlen(smb_target)+1 as the length, reading one byte past the allocated buffer. This fixes the following KASAN splat when accessing an SMB symlink with a target of '\a\b': BUG: KASAN: slab-out-of-bounds in smb2_parse_native_symlink+0x4f5/0xca0 Read of size 5 at addr ffff88800878fe21 by task netfsfuzz-execu/1 CPU: 1 UID: 0 PID: 1 Comm: netfsfuzz-execu Tainted: G N 7.2.0-11943-g2709dd5ae32f-dirty #1 PREEMPT(lazy) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996) Call Trace: <TASK> dump_stack_lvl+0x7b/0xa0 print_report+0xd0/0x630 kasan_report+0xe5/0x120 kasan_check_range+0x105/0x1b0 __asan_memcpy+0x23/0x60 smb2_parse_native_symlink+0x4f5/0xca0 parse_reparse_point+0x68a/0x1530 reparse_info_to_fattr+0x752/0xa20 cifs_get_fattr+0x873/0x15b0 cifs_get_inode_info+0xc0/0x310 cifs_lookup+0x308/0xa70 __lookup_slow+0x122/0x2b0 lookup_slow+0x50/0x70 path_lookupat+0x525/0xaf0 filename_lookup+0x1f2/0x550 vfs_statx+0xd1/0x1a0 vfs_fstatat+0x65/0xc0 __do_sys_newfstatat+0x9a/0x120 do_syscall_64+0xdd/0x4a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 430afd3edabf942a908570e5a41414bb455f15f8 · fixed in ff411fcbfc55eec1d66ea82483d254319dc8e973; From fc5a409552be479715b147748f2f61b41b512976 · fixed in 22a9d0a9ba0c89be57558c1aa80dc60a571dd89c; From 723f4ef90452aa629f3d923e92e0449d69362b1d · fixed in d1f173d28e964ba2c3c4ebe7491d594dc8c77a40; From 723f4ef90452aa629f3d923e92e0449d69362b1d · fixed in 2a302fdbaf7dd00d285303c94af8f48321c22993; From 723f4ef90452aa629f3d923e92e0449d69362b1d · fixed in cb26524ef4ac28fcfa554c0656e8dc412c38a8ff; From 6.6.64 · fixed in 6.6.158; From 6.12.2 · fixed in 6.12.111; From 6.11.11 · fixed in 6.12
- Linux Linux
6.13
- KernelLinux
fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; fixed in 7.2.7