Hildegard: New TeamTNT Cryptojacking Malware Targeting Kubernetes
BOtB can perform a container breakout using a known vulnerability such as CVE-2019-5736.
CVE-2019-5736 Public exploit EPSS 98.5%
runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc…
Summary
The flaw is a file-descriptor mishandling issue, tied to /proc/self/exe, in runc through 1.0-rc6 as used in Docker before 18.09.2 and other products. An attacker who can run a command as root in a container, either by starting a new container from an attacker-controlled image or by using docker exec on an existing container they already have write access to, can overwrite the host runc binary and gain root access on the host.
Official description · CVE.org
runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec. This occurs because of file-descriptor mishandling, related to /proc/self/exe.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
66.2 / 100
- Exploited
- Yes, in VulnCheck KEV
- Reports
- 1
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.How attackers get in
What they do
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 4 years after disclosure. Public exploit code (Metasploit) was available 41 days before disclosure.
- Public exploit codeMetasploit41 days before
- Disclosedday 0
- Named in a threat reportunit42.paloaltonetworks.com+24 mo
- First seen exploitedVulnCheck KEV evidence+4 yrs
Patch historyEarlier and later CVEs in the same code, in date order. It shows when a fix was bypassed or incomplete and which version finally fixed it.
See the family treeA fix was bypassed or incomplete once over 5 years.
Same bug familyLinked by evidence that a fix failed or the same code was patched again. Oldest first.
relatedMedium
Why these are linked: Link confidenceHow strong the evidence is that two CVEs are related. High: stated in the CVE text or linked in an advisory, or the same code was patched one release apart. Medium: the same code, or a version step plus a similar description. Low: similar description only.
- Same code patched: nsexec.c (machine-matched)Functions: nsexeccommit 50a19c6commit 5d93fedcommit 6635b4fcommit 0a8e411
This CVECVE-2019-5736runc through 1.0-rc6, as used in Docker before 18.09.2 and other…11 Feb 2019relatedLow
Why these are linked: Link confidenceHow strong the evidence is that two CVEs are related. High: stated in the CVE text or linked in an advisory, or the same code was patched one release apart. Medium: the same code, or a version step plus a similar description. Low: similar description only.
- Stated in the CVE text
This is similar to CVE-2019-5736.
- Stated in the CVE text
- same family
- same family
14 more CVEs are in this family. See the family tree
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 2ExecutionTA0002
Deploy Container T1610 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · how it is exploited
attacker runs commands inside container
a command as root within one of these types of containers
Privilege EscalationTA0004
Escape to Host T1611 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · primary impact
container escape to host root
overwrite the host runc binary (and consequently obtain host root access)
Detection
0 rules for this CVE · 2 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2019-5736 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Escape to HostT16112 general rules
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 1 threat report1 reportUnit 42Feb 2021
Reports are matched by finding the exact id CVE-2019-5736 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
Also mentioned in 10 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
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