CyberSecBulletin
CVE-2022-34862NVD status: Modified

BIG-IP: Loop with Unreachable Exit Condition

Published Updated By the CyberSecBulletin desk

CVE-2022-34862 is a high-severity loop with unreachable exit condition vulnerability in BIG-IP from F5, with a CVSS 3.1 base score of 7.5 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 13.1.x*, 14.1.5, 15.1.6.1 as the first without the flaw, so updating BIG-IP to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.28% chance of exploitation within 30 days, higher than 70% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update BIG-IP to 13.1.x* or 14.1.5 or 15.1.6.1 or 16.1.3.1, whichever matches your release line, or a later version.
  2. Update Big-ip Access Policy Manager to 14.1.5 or 15.1.6.1 or 16.1.3.1, whichever matches your release line, or a later version.
  3. Update Big-ip Advanced Firewall Manager to 14.1.5 or 15.1.6.1 or 16.1.3.1, whichever matches your release line, or a later version.
  4. Read the advisory on support.f5.com for workarounds and exact fixed builds.
  5. 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
F5BIG-IP13.1.0 up to, but not including, 13.1.x*; 14.1.x up to, but not including, 14.1.5; 15.1.x up to, but not including, 15.1.6.1; 16.1.x up to, but not including, 16.1.3.113.1.x*, 14.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Access Policy Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Advanced Firewall Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Analytics13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Application Acceleration Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Application Security Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Domain Name System13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Fraud Protection Service13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Global Traffic Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Link Controller13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Local Traffic Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1
F5Big-ip Policy Enforcement Manager13.1.0 through 13.1.5; 14.1.0 up to, but not including, 14.1.5; 15.1.0 up to, but not including, 15.1.6.1; 16.1.0 up to, but not including, 16.1.3.114.1.5, 15.1.6.1, 16.1.3.1

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
LowNo special conditions are needed; the attack works reliably.
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
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCNA (f5.com)
CVSS 3.17.5HighNVD

Official description

In BIG-IP Versions 16.1.x before 16.1.3.1, 15.1.x before 15.1.6.1, 14.1.x before 14.1.5, and all versions of 13.1.x, when an LTM virtual server is configured to perform normalization, undisclosed requests can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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

The underlying weakness: Loop with Unreachable Exit Condition

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

More Loop with Unreachable Exit Condition vulnerabilities (CWE-835)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in BIG-IP

All BIG-IP vulnerabilities

Recent Loop with Unreachable Exit Condition vulnerabilities

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