Excess privilege granted to cloud identities is a key component in 99 per cent of all security tests performed by IBM’s X-Force Red penetration testing team, according to a report released by the vendor.
Both human users and service accounts were consistently found to have more access rights and privileges than they generally need, which makes exploiting a successful breach in a cloud system much easier than it would otherwise be, the report said.
“This set-up enabled attackers who managed to get a foothold in the environment to pivot and move laterally to exploit additional cloud components or assets,” according to the report.
That’s bad news for the cloud sector, which also saw a 200 per cent increase in the number of compromised accounts being sold on the dark web, and an increase in the average severity score of vulnerabilities found in cloud systems, IBM said. That severity score, which is based onCVSS, rose to an average of 18 in the latest report, up from 15 ten years ago.
“It stands to reason that as the number of available cloud-based applications rises, more cloud-related vulnerabilities will be disclosed, which increases the overall attack surface for cloud environments,” the report said.
Cloud security lapses lead to cryptomining, ransomware
The total number of cloud-based vulnerabilities also increased substantially over the course of the past year, the report’s authors added, with 28 per cent growth. The most common malware deployed as a result of compromised cloud systems was cryptoming (also called cryptojacking) and ransomware, although data exfiltration and extortion attacks were also seen.
Cryptomining is a particularly attractive activity for malicious hackers targeting the cloud, according to IBM, for several reasons, including the ability to transfer the costs of mining onto the victim, the perceived lack of vigilance over cloud services as compared to on-premises systems and the presence of known vulnerabilities in cloud computing.
Along with misconfigurations, which remain a common way in for malicious hackers, two major vulnerabilities proved significantly attractive as targets for bad actors going after cloud systems.
The Log4j vulnerability — an exploitable flaw in an Apache library that is widely used by cloud service providers — was heavily targeted by ransomware groups like NightSky and Conti, as well as several families of Linux-based cryptomining malware, including Monero, B1txor20, Mirai and more.
“Our [incident reporting] experience reflects that threat actors have significant and growing cloud expertise,” the report said. “With few exceptions, these threat actors operate unconstrained by a client’s cloud hosting preferences, rules of law or any physical geographic boundaries.”