gsd-2023-52523
Vulnerability from gsd
Modified
2024-02-21 06:01
Details
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets
With a SOCKMAP/SOCKHASH map and an sk_msg program user can steer messages
sent from one TCP socket (s1) to actually egress from another TCP
socket (s2):
tcp_bpf_sendmsg(s1) // = sk_prot->sendmsg
tcp_bpf_send_verdict(s1) // __SK_REDIRECT case
tcp_bpf_sendmsg_redir(s2)
tcp_bpf_push_locked(s2)
tcp_bpf_push(s2)
tcp_rate_check_app_limited(s2) // expects tcp_sock
tcp_sendmsg_locked(s2) // ditto
There is a hard-coded assumption in the call-chain, that the egress
socket (s2) is a TCP socket.
However in commit 122e6c79efe1 ("sock_map: Update sock type checks for
UDP") we have enabled redirects to non-TCP sockets. This was done for the
sake of BPF sk_skb programs. There was no indention to support sk_msg
send-to-egress use case.
As a result, attempts to send-to-egress through a non-TCP socket lead to a
crash due to invalid downcast from sock to tcp_sock:
BUG: kernel NULL pointer dereference, address: 000000000000002f
...
Call Trace:
<TASK>
? show_regs+0x60/0x70
? __die+0x1f/0x70
? page_fault_oops+0x80/0x160
? do_user_addr_fault+0x2d7/0x800
? rcu_is_watching+0x11/0x50
? exc_page_fault+0x70/0x1c0
? asm_exc_page_fault+0x27/0x30
? tcp_tso_segs+0x14/0xa0
tcp_write_xmit+0x67/0xce0
__tcp_push_pending_frames+0x32/0xf0
tcp_push+0x107/0x140
tcp_sendmsg_locked+0x99f/0xbb0
tcp_bpf_push+0x19d/0x3a0
tcp_bpf_sendmsg_redir+0x55/0xd0
tcp_bpf_send_verdict+0x407/0x550
tcp_bpf_sendmsg+0x1a1/0x390
inet_sendmsg+0x6a/0x70
sock_sendmsg+0x9d/0xc0
? sockfd_lookup_light+0x12/0x80
__sys_sendto+0x10e/0x160
? syscall_enter_from_user_mode+0x20/0x60
? __this_cpu_preempt_check+0x13/0x20
? lockdep_hardirqs_on+0x82/0x110
__x64_sys_sendto+0x1f/0x30
do_syscall_64+0x38/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Reject selecting a non-TCP sockets as redirect target from a BPF sk_msg
program to prevent the crash. When attempted, user will receive an EACCES
error from send/sendto/sendmsg() syscall.
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2023-52523"
],
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets\n\nWith a SOCKMAP/SOCKHASH map and an sk_msg program user can steer messages\nsent from one TCP socket (s1) to actually egress from another TCP\nsocket (s2):\n\ntcp_bpf_sendmsg(s1)\t\t// = sk_prot-\u003esendmsg\n tcp_bpf_send_verdict(s1)\t// __SK_REDIRECT case\n tcp_bpf_sendmsg_redir(s2)\n tcp_bpf_push_locked(s2)\n\ttcp_bpf_push(s2)\n\t tcp_rate_check_app_limited(s2) // expects tcp_sock\n\t tcp_sendmsg_locked(s2)\t // ditto\n\nThere is a hard-coded assumption in the call-chain, that the egress\nsocket (s2) is a TCP socket.\n\nHowever in commit 122e6c79efe1 (\"sock_map: Update sock type checks for\nUDP\") we have enabled redirects to non-TCP sockets. This was done for the\nsake of BPF sk_skb programs. There was no indention to support sk_msg\nsend-to-egress use case.\n\nAs a result, attempts to send-to-egress through a non-TCP socket lead to a\ncrash due to invalid downcast from sock to tcp_sock:\n\n BUG: kernel NULL pointer dereference, address: 000000000000002f\n ...\n Call Trace:\n \u003cTASK\u003e\n ? show_regs+0x60/0x70\n ? __die+0x1f/0x70\n ? page_fault_oops+0x80/0x160\n ? do_user_addr_fault+0x2d7/0x800\n ? rcu_is_watching+0x11/0x50\n ? exc_page_fault+0x70/0x1c0\n ? asm_exc_page_fault+0x27/0x30\n ? tcp_tso_segs+0x14/0xa0\n tcp_write_xmit+0x67/0xce0\n __tcp_push_pending_frames+0x32/0xf0\n tcp_push+0x107/0x140\n tcp_sendmsg_locked+0x99f/0xbb0\n tcp_bpf_push+0x19d/0x3a0\n tcp_bpf_sendmsg_redir+0x55/0xd0\n tcp_bpf_send_verdict+0x407/0x550\n tcp_bpf_sendmsg+0x1a1/0x390\n inet_sendmsg+0x6a/0x70\n sock_sendmsg+0x9d/0xc0\n ? sockfd_lookup_light+0x12/0x80\n __sys_sendto+0x10e/0x160\n ? syscall_enter_from_user_mode+0x20/0x60\n ? __this_cpu_preempt_check+0x13/0x20\n ? lockdep_hardirqs_on+0x82/0x110\n __x64_sys_sendto+0x1f/0x30\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nReject selecting a non-TCP sockets as redirect target from a BPF sk_msg\nprogram to prevent the crash. When attempted, user will receive an EACCES\nerror from send/sendto/sendmsg() syscall.",
"id": "GSD-2023-52523",
"modified": "2024-02-21T06:01:53.400983Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
"cve.org": {
"CVE_data_meta": {
"ASSIGNER": "cve@kernel.org",
"ID": "CVE-2023-52523",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Linux",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_name": "122e6c79efe1",
"version_value": "bc8b89b69638"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
"defaultStatus": "affected",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"lessThan": "5.13",
"status": "unaffected",
"version": "0",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.135",
"versionType": "custom"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.57",
"versionType": "custom"
},
{
"lessThanOrEqual": "6.5.*",
"status": "unaffected",
"version": "6.5.7",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix"
}
]
}
}
]
}
}
]
},
"vendor_name": "Linux"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets\n\nWith a SOCKMAP/SOCKHASH map and an sk_msg program user can steer messages\nsent from one TCP socket (s1) to actually egress from another TCP\nsocket (s2):\n\ntcp_bpf_sendmsg(s1)\t\t// = sk_prot-\u003esendmsg\n tcp_bpf_send_verdict(s1)\t// __SK_REDIRECT case\n tcp_bpf_sendmsg_redir(s2)\n tcp_bpf_push_locked(s2)\n\ttcp_bpf_push(s2)\n\t tcp_rate_check_app_limited(s2) // expects tcp_sock\n\t tcp_sendmsg_locked(s2)\t // ditto\n\nThere is a hard-coded assumption in the call-chain, that the egress\nsocket (s2) is a TCP socket.\n\nHowever in commit 122e6c79efe1 (\"sock_map: Update sock type checks for\nUDP\") we have enabled redirects to non-TCP sockets. This was done for the\nsake of BPF sk_skb programs. There was no indention to support sk_msg\nsend-to-egress use case.\n\nAs a result, attempts to send-to-egress through a non-TCP socket lead to a\ncrash due to invalid downcast from sock to tcp_sock:\n\n BUG: kernel NULL pointer dereference, address: 000000000000002f\n ...\n Call Trace:\n \u003cTASK\u003e\n ? show_regs+0x60/0x70\n ? __die+0x1f/0x70\n ? page_fault_oops+0x80/0x160\n ? do_user_addr_fault+0x2d7/0x800\n ? rcu_is_watching+0x11/0x50\n ? exc_page_fault+0x70/0x1c0\n ? asm_exc_page_fault+0x27/0x30\n ? tcp_tso_segs+0x14/0xa0\n tcp_write_xmit+0x67/0xce0\n __tcp_push_pending_frames+0x32/0xf0\n tcp_push+0x107/0x140\n tcp_sendmsg_locked+0x99f/0xbb0\n tcp_bpf_push+0x19d/0x3a0\n tcp_bpf_sendmsg_redir+0x55/0xd0\n tcp_bpf_send_verdict+0x407/0x550\n tcp_bpf_sendmsg+0x1a1/0x390\n inet_sendmsg+0x6a/0x70\n sock_sendmsg+0x9d/0xc0\n ? sockfd_lookup_light+0x12/0x80\n __sys_sendto+0x10e/0x160\n ? syscall_enter_from_user_mode+0x20/0x60\n ? __this_cpu_preempt_check+0x13/0x20\n ? lockdep_hardirqs_on+0x82/0x110\n __x64_sys_sendto+0x1f/0x30\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nReject selecting a non-TCP sockets as redirect target from a BPF sk_msg\nprogram to prevent the crash. When attempted, user will receive an EACCES\nerror from send/sendto/sendmsg() syscall."
}
]
},
"generator": {
"engine": "bippy-4986f5686161"
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://git.kernel.org/stable/c/bc8b89b6963803a123f64aa9494155a037b3d728",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/bc8b89b6963803a123f64aa9494155a037b3d728"
},
{
"name": "https://git.kernel.org/stable/c/b8f97e47b6fb84fcf2f5a22e725eefb6cf5070c2",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/b8f97e47b6fb84fcf2f5a22e725eefb6cf5070c2"
},
{
"name": "https://git.kernel.org/stable/c/ded6e448028f0f91b6af35985afca01fa02a9089",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/ded6e448028f0f91b6af35985afca01fa02a9089"
},
{
"name": "https://git.kernel.org/stable/c/b80e31baa43614e086a9d29dc1151932b1bd7fc5",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/b80e31baa43614e086a9d29dc1151932b1bd7fc5"
}
]
}
},
"nvd.nist.gov": {
"cve": {
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets\n\nWith a SOCKMAP/SOCKHASH map and an sk_msg program user can steer messages\nsent from one TCP socket (s1) to actually egress from another TCP\nsocket (s2):\n\ntcp_bpf_sendmsg(s1)\t\t// = sk_prot-\u003esendmsg\n tcp_bpf_send_verdict(s1)\t// __SK_REDIRECT case\n tcp_bpf_sendmsg_redir(s2)\n tcp_bpf_push_locked(s2)\n\ttcp_bpf_push(s2)\n\t tcp_rate_check_app_limited(s2) // expects tcp_sock\n\t tcp_sendmsg_locked(s2)\t // ditto\n\nThere is a hard-coded assumption in the call-chain, that the egress\nsocket (s2) is a TCP socket.\n\nHowever in commit 122e6c79efe1 (\"sock_map: Update sock type checks for\nUDP\") we have enabled redirects to non-TCP sockets. This was done for the\nsake of BPF sk_skb programs. There was no indention to support sk_msg\nsend-to-egress use case.\n\nAs a result, attempts to send-to-egress through a non-TCP socket lead to a\ncrash due to invalid downcast from sock to tcp_sock:\n\n BUG: kernel NULL pointer dereference, address: 000000000000002f\n ...\n Call Trace:\n \u003cTASK\u003e\n ? show_regs+0x60/0x70\n ? __die+0x1f/0x70\n ? page_fault_oops+0x80/0x160\n ? do_user_addr_fault+0x2d7/0x800\n ? rcu_is_watching+0x11/0x50\n ? exc_page_fault+0x70/0x1c0\n ? asm_exc_page_fault+0x27/0x30\n ? tcp_tso_segs+0x14/0xa0\n tcp_write_xmit+0x67/0xce0\n __tcp_push_pending_frames+0x32/0xf0\n tcp_push+0x107/0x140\n tcp_sendmsg_locked+0x99f/0xbb0\n tcp_bpf_push+0x19d/0x3a0\n tcp_bpf_sendmsg_redir+0x55/0xd0\n tcp_bpf_send_verdict+0x407/0x550\n tcp_bpf_sendmsg+0x1a1/0x390\n inet_sendmsg+0x6a/0x70\n sock_sendmsg+0x9d/0xc0\n ? sockfd_lookup_light+0x12/0x80\n __sys_sendto+0x10e/0x160\n ? syscall_enter_from_user_mode+0x20/0x60\n ? __this_cpu_preempt_check+0x13/0x20\n ? lockdep_hardirqs_on+0x82/0x110\n __x64_sys_sendto+0x1f/0x30\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nReject selecting a non-TCP sockets as redirect target from a BPF sk_msg\nprogram to prevent the crash. When attempted, user will receive an EACCES\nerror from send/sendto/sendmsg() syscall."
}
],
"id": "CVE-2023-52523",
"lastModified": "2024-03-04T13:58:23.447",
"metrics": {},
"published": "2024-03-02T22:15:48.213",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b80e31baa43614e086a9d29dc1151932b1bd7fc5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b8f97e47b6fb84fcf2f5a22e725eefb6cf5070c2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bc8b89b6963803a123f64aa9494155a037b3d728"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ded6e448028f0f91b6af35985afca01fa02a9089"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.