| Package | Affected versions | Patched versions |
|---|---|---|
| twisted | ≥ 21.7.0, < 22.2.0 | 22.2.0 |
| http server | = 12.2.1.3.0= 12.2.1.4.0 | |
| zfs storage appliance kit | = 8.8 | |
| twisted | ≥ 21.7.0, < 22.2.0 | 22.2.0 |
The Twisted SSH client and server implementation naively accepted an infinite amount of data for the peer's SSH version identifier.
A malicious peer can trivially craft a request that uses all available memory and crash the server, resulting in denial of service. The attack is as simple as nc -rv localhost 22 < /dev/zero.
The issue was fix in GitHub commit https://github.com/twisted/twisted/commit/98387b39e9f0b21462f6abc7a1325dc370fcdeb1
A fix is available in Twisted 22.2.0.
Reported at https://twistedmatrix.com/trac/ticket/10284 Discussions at https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
Found by vin01
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