CyberSecBulletin
CVE-2023-29483NVD status: Modified

eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to…

Published Updated By the CyberSecBulletin desk

CVE-2023-29483 is a high-severity vulnerability in eventlet, with a CVSS 3.1 base score of 7.0 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 0.35.2, 2.6.0 as the first without the flaw, so updating eventlet to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.86% chance of exploitation within 30 days, higher than 80% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update eventlet to 0.35.2 or 2.6.0, whichever matches your release line, or a later version.
  2. Update Dnspython to 2.6.0 or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Eventleteventletbefore 0.35.2; before 2.6.00.35.2, 2.6.0
DnspythonDnspythonbefore 2.6.02.6.0
Fedora ProjectFedora38; 39; 40Not stated
NetAppBootstrap OSNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
LowSome restricted data can be read.
Integrity
LowLimited modification of data is possible.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H. Scored by CISA (ADP).

Official description

eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other vulnerabilities in eventlet

All eventlet vulnerabilities

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