Description
In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
AT&T Bell Labs UNIX
Default version status: unknown
4affected
References
- https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/ ↗
- https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html ↗
- https://discuss.systems/@ricci/115747843169814700 ↗
- https://www.spinellis.gr/blog/20251223/ ↗
- http://www.openwall.com/lists/oss-security/2026/03/20/6 ↗
- http://www.openwall.com/lists/oss-security/2026/03/21/4 ↗