CVE-2021-47068
net/nfc: fix use-after-free llcp_sock_bind/connect
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
net/nfc: fix use-after-free llcp_sock_bind/connect
Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()")
and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()")
fixed a refcount leak bug in bind/connect but introduced a
use-after-free if the same local is assigned to 2 different sockets.
This can be triggered by the following simple program:
int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) );
addr.sa_family = AF_NFC;
addr.nfc_protocol = NFC_PROTO_NFC_DEP;
bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
close(sock1);
close(sock2);
Fix this by assigning NULL to llcp_sock->local after calling
nfc_llcp_local_put.
This addresses CVE-2021-23134.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/nfc: corrige use-after-free llcp_sock_bind/connect Commits 8a4cd82d ("nfc: corrige la fuga de refcount en llcp_sock_connect()") y c33b1cc62 ("nfc: corrige la fuga de refcount en llcp_sock_bind()") corrigió un error de fuga de recuento en bind/connect pero introdujo un Use-After-Free si el mismo local está asignado a 2 sockets diferentes. Esto puede activarse mediante el siguiente programa simple: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = conector (AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) & addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) & addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); cerrar(calcetín2); Solucione este problema asignando NULL a llcp_sock->local después de llamar a nfc_llcp_local_put. Esto aborda CVE-2021-23134.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-29 CVE Reserved
- 2024-02-29 CVE Published
- 2024-12-17 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (17)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/a1cdd18c49d23ec38097ac2c5b0d761146fc0109 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/18013007b596771bf5f5e7feee9586fb0386ad14 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/538a6ff11516d38a61e237d2d2dc04c30c845fbe | Vuln. Introduced | |
| https://git.kernel.org/stable/c/adbb1d218c5f56dbae052765da83c0f57fce2a31 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/c89903c9eff219a4695e63715cf922748d743f65 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/8c9e4971e142e2899606a2490b77a1208c1f4638 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.4.267 < 4.4.269 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.267 < 4.4.269" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.9.267 < 4.9.269 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.267 < 4.9.269" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14.231 < 4.14.233 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.231 < 4.14.233" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19.187 < 4.19.191 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.187 < 4.19.191" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.4.112 < 5.4.119 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.112 < 5.4.119" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.10.30 < 5.10.37 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.30 < 5.10.37" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.11.14 < 5.11.21 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11.14 < 5.11.21" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.12 < 5.12.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.12.4" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.12 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.13" | en |
Affected
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