CyberSecBulletin
CVE-2022-30634NVD status: Modified

crypto/rand: Loop with Unreachable Exit Condition

Published Updated By the CyberSecBulletin desk

CVE-2022-30634 is a high-severity loop with unreachable exit condition vulnerability in crypto/rand from Go standard library, 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 1.17.11, 1.18.3 as the first without the flaw, so updating crypto/rand to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.28% chance of exploitation within 30 days, higher than 83% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update crypto/rand to 1.17.11 or 1.18.3, whichever matches your release line, or a later version.
  2. Update Go to 1.17.11 or 1.18.3, whichever matches your release line, 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
Go standard librarycrypto/randbefore 1.17.11; 1.18.0-0 up to, but not including, 1.18.31.17.11, 1.18.3
GoGobefore 1.17.11; 1.18.0 up to, but not including, 1.18.31.17.11, 1.18.3
NetAppCloud Insights Telegraf AgentNot 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
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.

Official description

Infinite loop in Read in crypto/rand before Go 1.17.11 and Go 1.18.3 on Windows allows attacker to cause an indefinite hang by passing a buffer larger than 1 << 32 - 1 bytes.

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

Third-party and government advisories

Technical write-ups (may include proof of concept)

Recent Loop with Unreachable Exit Condition vulnerabilities

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