CyberSecBulletin
CVE-2023-30638NVD status: Modified

Unify Openscape Bcf: Improper Neutralization of Special Elements used in a Command

Published Updated By the CyberSecBulletin desk

CVE-2023-30638 is a high-severity improper neutralization of special elements used in a command vulnerability in Unify Openscape Bcf from Atos, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists version 10r10.7.0 as the first without the flaw, so updating Unify Openscape Bcf to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.96% chance of exploitation within 30 days, higher than 62% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Unify Openscape Bcf to 10r10.7.0 or a later version.
  2. Update Unify Openscape Branch to 10r3.1.2 or a later version.
  3. Update Unify Openscape Session Border Controller to 10r3.1.3 or a later version.
  4. Read the advisory on networks.unify.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
AtosUnify Openscape Bcf10 up to, but not including, 10r10.7.010r10.7.0
AtosUnify Openscape Branch10 up to, but not including, 10r3.1.210r3.1.2
AtosUnify Openscape Session Border Controller10 up to, but not including, 10r3.1.310r3.1.3

Version data comes from NVD's product matching. 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
HighAdministrator-level access is required first.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.17.2HighCNA (mitre.org)
CVSS 3.17.2HighNVD
CVSS 3.17.2HighCISA (ADP)

Official description

Atos Unify OpenScape SBC 10 before 10R3.1.3, OpenScape Branch 10 before 10R3.1.2, and OpenScape BCF 10 before 10R10.7.0 allow remote authenticated admins to inject commands.

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

The underlying weakness: Improper Neutralization of Special Elements used in a Command

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • If possible, ensure that all external commands called from the program are statically created.
  • Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.

More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in Unify Openscape Bcf

All Unify Openscape Bcf vulnerabilities

Recent Improper Neutralization of Special Elements used in a Command vulnerabilities

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