Plattform
ruby
Komponente
safemode
Behoben in
1.3.2
CVE-2017-7540 affects Foreman versions 1.3.1 and earlier. This vulnerability allows attackers to bypass safe mode limitations within the Foreman environment, potentially leading to unauthorized object deletion or privilege escalation. The vulnerability stems from a flaw in the rubygem-safemode gem, which Foreman utilizes. A fix is available in version 1.3.2.
The impact of CVE-2017-7540 is significant. An attacker exploiting this vulnerability could delete critical infrastructure components managed by Foreman, disrupting operations and potentially causing data loss. The ability to bypass safe mode restrictions also opens the door to privilege escalation, allowing an attacker to gain unauthorized access to sensitive data and systems. This bypass is achieved through the use of special Ruby syntax, making it difficult to detect without proper security controls. The potential for widespread disruption makes this a high-priority vulnerability to address.
CVE-2017-7540 was publicly disclosed on October 24, 2017. While no active exploitation campaigns have been definitively linked to this CVE, the CRITICAL severity and potential for privilege escalation warrant careful attention. There are publicly available proof-of-concept exploits demonstrating the bypass technique. This vulnerability has not been added to the CISA KEV catalog as of the current date.
Organizations heavily reliant on Foreman for infrastructure management are particularly at risk. Environments with legacy Foreman installations or those that have not implemented robust access controls are also more vulnerable. Shared hosting environments utilizing Foreman pose a significant risk due to the potential for cross-tenant exploitation.
• ruby / server:
find /opt/foreman/embedded/lib/ruby/gems -name 'safemode.rb' -print0 | xargs -0 grep -i 'eval' • ruby / supply-chain:
curl -s https://rubygems.org/gems/safemode/versions.html | grep '1.3.1' disclosure
patch
Exploit-Status
EPSS
0.29% (52% Perzentil)
CVSS-Vektor
The primary mitigation for CVE-2017-7540 is to upgrade Foreman to version 1.3.2 or later, which contains the fix for this vulnerability. If upgrading is not immediately feasible, consider implementing stricter access controls within Foreman to limit the potential impact of a successful exploit. Review and audit existing Foreman configurations to identify any potential misconfigurations that could exacerbate the vulnerability. While a direct WAF rule is unlikely, implementing general input validation rules can help prevent the injection of malicious Ruby code. After upgrading, confirm the fix by attempting to execute a potentially malicious Ruby command within Foreman and verifying that safe mode restrictions are enforced.
Kein offizieller Patch verfügbar. Prüfe auf Workarounds oder überwache auf Updates.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2017-7540 is a critical vulnerability in Foreman versions up to 1.3.1 that allows attackers to bypass safe mode limitations, potentially leading to object deletion or privilege escalation.
You are affected if you are running Foreman versions 1.3.1 or earlier. Upgrade to 1.3.2 or later to mitigate the risk.
Upgrade Foreman to version 1.3.2 or later. If immediate upgrade is not possible, implement stricter access controls and review configurations.
While no active campaigns have been definitively linked, the CRITICAL severity and available proof-of-concept exploits warrant caution.
Refer to the official Foreman security advisory: https://www.foreman.io/security/advisories/sa-2017-006/
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