7.8

CVE-2021-47068

net/nfc: fix use-after-free llcp_sock_bind/connect

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.4.267 < 4.4.269
Linux ≫ Linux Kernel Version >= 4.9.267 < 4.9.269
Linux ≫ Linux Kernel Version >= 4.14.231 < 4.14.233
Linux ≫ Linux Kernel Version >= 4.19.187 < 4.19.191
Linux ≫ Linux Kernel Version >= 5.4.112 < 5.4.119
Linux ≫ Linux Kernel Version >= 5.10.30 < 5.10.37
Linux ≫ Linux Kernel Version >= 5.11.14 < 5.11.21
Linux ≫ Linux Kernel Version >= 5.12 < 5.12.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.23% 0.138
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299
Patch
https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c
Patch
https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6
Patch
https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91
Patch
https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610
Patch
https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e
Patch
https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6
Patch
https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570
Patch
https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c
Patch