cve-2023-52767
Vulnerability from cvelistv5
Published
2024-05-21 15:30
Modified
2024-08-02 23:11
Severity
Summary
tls: fix NULL deref on tls_sw_splice_eof() with empty record
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: fix NULL deref on tls_sw_splice_eof() with empty record\n\nsyzkaller discovered that if tls_sw_splice_eof() is executed as part of\nsendfile() when the plaintext/ciphertext sk_msg are empty, the send path\ngets confused because the empty ciphertext buffer does not have enough\nspace for the encryption overhead. This causes tls_push_record() to go on\nthe `split = true` path (which is only supposed to be used when interacting\nwith an attached BPF program), and then get further confused and hit the\ntls_merge_open_record() path, which then assumes that there must be at\nleast one populated buffer element, leading to a NULL deref.\n\nIt is possible to have empty plaintext/ciphertext buffers if we previously\nbailed from tls_sw_sendmsg_locked() via the tls_trim_both_msgs() path.\ntls_sw_push_pending_record() already handles this case correctly; let\u0027s do\nthe same check in tls_sw_splice_eof()."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52767\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:15.917\",\"lastModified\":\"2024-05-21T16:53:56.550\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntls: fix NULL deref on tls_sw_splice_eof() with empty record\\n\\nsyzkaller discovered that if tls_sw_splice_eof() is executed as part of\\nsendfile() when the plaintext/ciphertext sk_msg are empty, the send path\\ngets confused because the empty ciphertext buffer does not have enough\\nspace for the encryption overhead. This causes tls_push_record() to go on\\nthe `split = true` path (which is only supposed to be used when interacting\\nwith an attached BPF program), and then get further confused and hit the\\ntls_merge_open_record() path, which then assumes that there must be at\\nleast one populated buffer element, leading to a NULL deref.\\n\\nIt is possible to have empty plaintext/ciphertext buffers if we previously\\nbailed from tls_sw_sendmsg_locked() via the tls_trim_both_msgs() path.\\ntls_sw_push_pending_record() already handles this case correctly; let\u0027s do\\nthe same check in tls_sw_splice_eof().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tls: corrige NULL deref en tls_sw_splice_eof() con registro vac\u00edo syzkaller descubri\u00f3 que si tls_sw_splice_eof() se ejecuta como parte de sendfile() cuando el texto plano/texto cifrado sk_msg est\u00e1 vac\u00edo, el env\u00edo La ruta se confunde porque el b\u00fafer de texto cifrado vac\u00edo no tiene suficiente espacio para la sobrecarga de cifrado. Esto hace que tls_push_record() vaya a la ruta `split = true` (que se supone que solo debe usarse al interactuar con un programa BPF adjunto), y luego se confunda a\u00fan m\u00e1s y acceda a la ruta tls_merge_open_record(), que luego supone que hay debe haber al menos un elemento de b\u00fafer poblado, lo que lleva a una deref NULL. Es posible tener buffers de texto plano/texto cifrado vac\u00edos si previamente salimos de tls_sw_sendmsg_locked() a trav\u00e9s de la ruta tls_trim_both_msgs(). tls_sw_push_pending_record() ya maneja este caso correctamente; hagamos la misma verificaci\u00f3n en tls_sw_splice_eof().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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