250 lines
13 KiB
JSON
250 lines
13 KiB
JSON
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"cveId": "CVE-2021-47496",
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"dateReserved": "2024-05-22T06:20:56.202Z",
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"datePublished": "2024-05-22T08:19:43.489Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tls: Fix flipped sign in tls_err_abort() calls\n\nsk->sk_err appears to expect a positive value, a convention that ktls\ndoesn't always follow and that leads to memory corruption in other code.\nFor instance,\n\n [kworker]\n tls_encrypt_done(..., err=<negative error from crypto request>)\n tls_err_abort(.., err)\n sk->sk_err = err;\n\n [task]\n splice_from_pipe_feed\n ...\n tls_sw_do_sendpage\n if (sk->sk_err) {\n ret = -sk->sk_err; // ret is positive\n\n splice_from_pipe_feed (continued)\n ret = actor(...) // ret is still positive and interpreted as bytes\n // written, resulting in underflow of buf->len and\n // sd->len, leading to huge buf->offset and bogus\n // addresses computed in later calls to actor()\n\nFix all tls_err_abort() callers to pass a negative error code\nconsistently and centralize the error-prone sign flip there, throwing in\na warning to catch future misuse and uninlining the function so it\nreally does only warn once."
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"value": "AV:N - The bug is in kTLS (net/tls): a remote peer of a kTLS-offloaded service can set a negative sk_err via tls_read_size()/tls_decrypt_done() by sending a malformed TLS record, then the server’s ordinary sendfile/splice TX path (tls_sw_do_sendpage) mis-handles that sk_err; per guidance, kTLS bugs driven by remote peer data are Network.\nAC:L - The attacker fully controls the malformed TLS records and can send them while the server is mid-sendfile/splice (or retry across connections); no race or memory-layout condition outside attacker influence is required for the sign-flip corruption.\nPR:N - An unauthenticated client of a public kTLS HTTPS/TLS service needs no account or capability on the host; setsockopt(TCP_ULP,\"tls\")/TLS_TX|RX also requires no capability once the tls module is loaded.\nUI:N - Exploitation needs only the attacker’s TLS traffic plus the server’s normal sendfile/splice response path; no separate victim user or administrator action is required.\nS:U - The pipe-buffer underflow and resulting UAF/OOB access corrupt kernel memory within the same host kernel authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - splice_from_pipe_feed underflows buf->len and advances buf->offset into bogus addresses, and syzbot observed a KASAN use-after-free read in __crypto_xor; that memory-corruption/UAF primitive is leverageable for arbitrary kernel disclosure.\nI:H - The same underflow drives later actor()/sendpage calls with huge offsets into reclaimed or adjacent memory, yielding OOB write and UAF write primitives that can be escalated to control-flow hijack.\nA:H - The resulting use-after-free and out-of-bounds accesses reliably oops/panic the kernel (as in the syzbot KASAN report), fully disrupting availability."
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