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CVE-2023-52443— apparmor: avoid crash when parsed profile name is empty

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于当解析的配置文件名称为空时aa_alloc_profile()崩溃。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 2 AI

T1562.004 T1547.003 · Time Providers

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 04dc715e24d0820bf8740e1a1135ed61fe162bc8< 9286ee97aa4803d99185768735011d0d65827c9e affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 1d8e62b5569cc1466ceb8a7e4872cf10160a9dcf affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 5ff00408e5029d3550ee77f62dc15f1e15c47f87 affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 0a12db736edbb4933e4274932aeea594b5876fa4 affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 9d4fa5fe2b1d56662afd14915a73b4d0783ffa45 affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 5c0392fdafb0a2321311900be83ffa572bef8203 affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 77ab09b92f16c8439a948d1af489196953dc4a0e affected
04dc715e24d0820bf8740e1a1135ed61fe162bc8< 55a8210c9e7d21ff2644809699765796d4bfb200 affected
… +10 more rows
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I. Basic Information for CVE-2023-52443

Vulnerability Information
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Vulnerability Title
apparmor: avoid crash when parsed profile name is empty
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid crash when parsed profile name is empty When processing a packed profile in unpack_profile() described like "profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}" a string ":samba-dcerpcd" is unpacked as a fully-qualified name and then passed to aa_splitn_fqname(). aa_splitn_fqname() treats ":samba-dcerpcd" as only containing a namespace. Thus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later aa_alloc_profile() crashes as the new profile name is NULL now. general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP: 0010:strlen+0x1e/0xa0 Call Trace: <TASK> ? strlen+0x1e/0xa0 aa_policy_init+0x1bb/0x230 aa_alloc_profile+0xb1/0x480 unpack_profile+0x3bc/0x4960 aa_unpack+0x309/0x15e0 aa_replace_profiles+0x213/0x33c0 policy_update+0x261/0x370 profile_replace+0x20e/0x2a0 vfs_write+0x2af/0xe00 ksys_write+0x126/0x250 do_syscall_64+0x46/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK> ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x1e/0xa0 It seems such behaviour of aa_splitn_fqname() is expected and checked in other places where it is called (e.g. aa_remove_profiles). Well, there is an explicit comment "a ns name without a following profile is allowed" inside. AFAICS, nothing can prevent unpacked "name" to be in form like ":samba-dcerpcd" - it is passed from userspace. Deny the whole profile set replacement in such case and inform user with EPROTO and an explaining message. Found by Linux Verification Center (linuxtesting.org).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于当解析的配置文件名称为空时aa_alloc_profile()崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 04dc715e24d0820bf8740e1a1135ed61fe162bc8 ~ 9286ee97aa4803d99185768735011d0d65827c9e -
Linux Linux 4.11 -

II. Public POCs for CVE-2023-52443

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III. Intelligence Information for CVE-2023-52443

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Mailing List Discussions for CVE-2023-52443 (2)

Other References for CVE-2023-52443 (8)

Same Patch Batch · Linux · 2024-02-22 · 17 CVEs total

CVE-2024-26592 9.8 CRITICAL ksmbd: fix UAF issue in ksmbd_tcp_new_connection()
CVE-2023-52447 7.8 HIGH bpf: Defer the free of inner map when necessary
CVE-2023-52444 7.8 HIGH f2fs: fix to avoid dirent corruption
CVE-2024-26589 7.8 HIGH bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS
CVE-2024-26586 7.8 HIGH mlxsw: spectrum_acl_tcam: Fix stack corruption
CVE-2024-26591 bpf: Fix re-attachment branch in bpf_tracing_prog_attach
CVE-2023-52452 bpf: Fix accesses to uninit stack slots
CVE-2023-52451 powerpc/pseries/memhp: Fix access beyond end of drmem array
CVE-2023-52450 perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill_topology()
CVE-2023-52449 mtd: Fix gluebi NULL pointer dereference caused by ftl notifier
CVE-2023-52448 gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump
CVE-2023-52446 bpf: Fix a race condition between btf_put() and map_free()
CVE-2023-52445 media: pvrusb2: fix use after free on context disconnection
CVE-2024-26590 erofs: fix inconsistent per-file compression format
CVE-2024-26588 LoongArch: BPF: Prevent out-of-bounds memory access
CVE-2024-26587 net: netdevsim: don't try to destroy PHC on VFs

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52443

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