Memory corruption via reversed OCB buffer advance
Published Jun 25, 2023 · Updated Aug 2, 2024
Out-of-bounds write in Nettle 3.9's OCB implementation allows remote attackers to corrupt memory with a sufficiently large message. In ocb_crypt_n, the multi-block loop advances the source pointer but subtracts the processed size from the destination pointer, so later iterations write before the output buffer. Triggering requires an application to pass attacker-controlled data large enough to repeat that OCB loop, resulting in a crash or other process corruption.
Summary
What happened
Out-of-bounds write in Nettle 3.9's OCB implementation allows remote attackers to corrupt memory with a sufficiently large message. In ocb_crypt_n, the multi-block loop advances the source pointer but subtracts the processed size from the destination pointer, so later iterations write before the output buffer. Triggering requires an application to pass attacker-controlled data large enough to repeat that OCB loop, resulting in a crash or other process corruption.
The record
- CVE
- CVE-2023-36660
- Published
- Jun 25, 2023
- Updated
- Aug 2, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
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