Bitbucket Data Center: Improper Neutralization of Special Elements used in a Command
CVE-2022-43781 is a critical-severity improper neutralization of special elements used in a command vulnerability in Bitbucket Data Center from Atlassian, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Bitbucket Data Center versions: before 7.17.12; before 7.21.6; before 7.6.19, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 98% chance of exploitation within 30 days, which is in the top 0.09% of all scored CVEs.
Exploitation in the next 30 days is more likely than not, according to EPSS.
What to do
- Update bitbucket to 7.6.19 or 7.17.12 or 7.21.6 or 8.0.5, whichever matches your release line, or a later version.
- Read the advisory on confluence.atlassian.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Atlassian | Bitbucket Data Center | before 7.17.12; before 7.21.6; before 7.6.19; before 8.0.5; before 8.1.5; before 8.2.4; before 8.3.3; before 8.4.2; and 1 more ranges | Not stated |
| Atlassian | Bitbucket Server | before 7.17.12; before 7.21.6; before 7.6.19; before 8.0.5; before 8.1.5; before 8.2.4; before 8.3.3; before 8.4.2; and 1 more ranges | Not stated |
| Atlassian | bitbucket | 7.0.0 up to, but not including, 7.6.19; 7.7.0 up to, but not including, 7.17.12; 7.18.0 up to, but not including, 7.21.6; 7.22.0 up to, but not including, 8.0.5; 8.1.0 up to, but not including, 8.1.5; 8.2.0 up to, but not including, 8.2.4; 8.3.0 up to, but not including, 8.3.3; 8.4.0 up to, but not including, 8.4.2 | 7.6.19, 7.17.12, 7.21.6, 8.0.5, 8.1.5, 8.2.4 |
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
- 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:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 3.1 | 9.8 | Critical | CISA (ADP) |
Official description
There is a command injection vulnerability using environment variables in Bitbucket Server and Data Center. An attacker with permission to control their username can exploit this issue to execute arbitrary code on the system. This vulnerability can be unauthenticated if the Bitbucket Server and Data Center instance has enabled “Allow public signup”.
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
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- confluence.atlassian.com/x/Y4hXRgMitigation, Release Notes
- jira.atlassian.com/browse/BSERV-13522Issue Tracking
Other vulnerabilities in Bitbucket Data Center
- 7.5 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Improper Neutralization of Special Elements used in a Command vulnerabilities
- 9.9 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
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