cryspen/libcrux · Security
libcrux: Potential Panic on Overlong Ciphertext Buffer
- GHSA ID
- GHSA-hc3c-63hc-2r9f
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
An application that passes in a ciphertext buffer of length greater
than ptxt.len() + TAG_LEN to libcrux_chacha20poly1305::encrypt or
libcrux_chacha20poly1305::xchacha20_poly1305::encrypt would
experience a panic.
Impact
An application where the length of the ciphertext buffer is under attacker control could be made to crash.
Mitigation
The fix makes it so that libcrux_chacha20poly1305::encrypt and
libcrux_chacha20poly1305::xchacha20_poly1305::encrypt no longer
panic in this case, but instead write out the ciphertext and tag into
the first ptxt.len() + TAG_LEN bytes of the provided buffer.
CWEs
- CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')