lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <2024022955-CVE-2021-47068-a416@gregkh> Date: Thu, 29 Feb 2024 23:38:05 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47068: net/nfc: fix use-after-free llcp_sock_bind/connect Description =========== 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. The Linux kernel CVE team has assigned CVE-2021-47068 to this issue. Affected and fixed versions =========================== Issue introduced in 4.4.267 with commit a1cdd18c49d2 and fixed in 4.4.269 with commit 26157c82ba75 Issue introduced in 4.9.267 with commit 18013007b596 and fixed in 4.9.269 with commit ccddad6dd285 Issue introduced in 4.14.231 with commit 538a6ff11516 and fixed in 4.14.233 with commit 18ae4a192a44 Issue introduced in 4.19.187 with commit adbb1d218c5f and fixed in 4.19.191 with commit 48fba458fe54 Issue introduced in 5.4.112 with commit c89903c9eff2 and fixed in 5.4.119 with commit e32352070bca Issue introduced in 5.10.30 with commit 6fb003e5ae18 and fixed in 5.10.37 with commit 6b7021ed36da Issue introduced in 5.11.14 with commit 8c9e4971e142 and fixed in 5.11.21 with commit 374cdde4dcc9 Issue introduced in 5.12 with commit c33b1cc62 and fixed in 5.12.4 with commit 18175fe17ae0 Issue introduced in 5.12 with commit c33b1cc62 and fixed in 5.13 with commit c61760e6940d Please see https://www.kernel.org or a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2021-47068 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/nfc/llcp_sock.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6 https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570 https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610 https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91 https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299 https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6
Powered by blists - more mailing lists