Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet parse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body without bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When encrypted_key_size > 64, decrypt_passphrase_encrypted_session_key() sets decrypted_key_size = encrypted_key_size and performs two out-of-bounds writes: 1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into decrypted_key[64] via scatterlist, overflowing into the parent ecryptfs_auth_tok struct. 2. memcpy(crypt_stat->key, decrypted_key, decrypted_key_size) writes into crypt_stat->key[64], corrupting root_iv, keysig_list, and mutexes in ecryptfs_crypt_stat. Only AES-192 (cipher code 0x08) enables this because it sets crypt_stat->key_size = 24 independently of encrypted_key_size, allowing crypto_skcipher_setkey() to succeed while encrypted_key_size exceeds ECRYPTFS_MAX_KEY_BYTES. The PKI decryption path (parse_tag_65_packet) already validates decrypted_key_size <= ECRYPTFS_MAX_KEY_BYTES; the passphrase path omits this check. Bound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also protects the 512-byte encrypted_key[] buffer, so the former 512-byte check is removed as redundant. [tyhicks: Adjust the code comment to refer to macros representing the buffer sizes rather than mentioning the buffer size values since they may change in the future]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 237fead619984cc48818fe12ee0ceada3f55b012 before 2cd21340163494d312836c77c9fbfe2530b3d075; affected 237fead619984cc48818fe12ee0ceada3f55b012 before e2152d491ae62d96a32ed59778680a242af1fbc6; affected 237fead619984cc48818fe12ee0ceada3f55b012 before d2802414081184f79a619ede178aeef3aa989793; affected 237fead619984cc48818fe12ee0ceada3f55b012 before 33e050cac841498b5175f0f385eee903fd98863c; affected 237fead619984cc48818fe12ee0ceada3f55b012 before ccd13eff0e7356d2aa28b127b577e4e5ad4563f5; affected 237fead619984cc48818fe12ee0ceada3f55b012 before 14cb36a500a5a3afbc955dbf69dabc565f1a3b26; affected 237fead619984cc48818fe12ee0ceada3f55b012 before a419c9ebfc9a40ee56aaad6dc68bfd67d400817b; affected 237fead619984cc48818fe12ee0ceada3f55b012 before 5babe9c177c364521e3e682b949c5a8c47f4a441 |
| Linux / Linux | affected 2.6.19; unaffected 0 before 2.6.19; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075
- https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6
- https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793
- https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c
- https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5
- https://git.kernel.org/stable/c/14cb36a500a5a3afbc955dbf69dabc565f1a3b26
- https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b
- https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441