A New Critical SolarWinds Zero
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2021-35211 | Unauthenticated RCE (Remote Memory Escape) in SolarWinds Serv-U Microsoft researchers discovered a remote code execution flaw in SolarWinds Serv-U, an out-of-bounds write (CWE-787) described as a "Remote Memory Escape" in the Windows-based Serv-U products. A remote, unauthenticated attacker can trigger the flaw over the network against servers running a version before 15.2.3 HF2 and gain privileged access to the machine hosting Serv-U, with a maximum CVSS 10.0 score reflecting no required privileges, no user interaction, and impact beyond the application's security scope. Both Serv-U Managed File Transfer and Serv-U Secure FTP for Windows are affected. The vulnerability has been exploited in the wild: Microsoft attributed July 2021 attacks exploiting the Serv-U zero-day to Chinese threat actors, later warned of an uptick in exploitation attempts, and the flaw was added to CISA KEV on 2021-11-03 with known ransomware use. Do: Upgrade Serv-U to 15.2.3 Hotfix 2 (HF2) or later per SolarWinds' instructions immediately, as the flaw is in CISA KEV with known exploitation including ransomware use. Audit Serv-U servers and their logs for signs of exploitation or compromise, and restrict internet exposure of Serv-U/FTP and SSH ports to trusted parties. | 10.0 | 91% | KEV ransomware |
| largeestimated tens of thousands of Serv-U deployments worldwide, with a few thousand instances directly internet-exposed |
Full article380 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananJul 13, 2021
SolarWinds, the Texas-based company that became the epicenter of a massive supply chain attack late last year, has issued patches to contain a remote code execution flaw in its Serv-U managed file transfer service.
The fixes, which target Serv-U Managed File Transfer and Serv-U Secure FTP products, arrive after Microsoft notified the IT management and remote monitoring software maker that the flaw was being exploited in the wild. The threat actor behind the exploitation remains unknown as yet, and it isn't clear exactly how the attack was carried out.
"Microsoft has provided evidence of limited, targeted customer impact, though SolarWinds does not currently have an estimate of how many customers may be directly affected by the vulnerability," SolarWinds said in an advisory published Friday, adding it's "unaware of the identity of the potentially affected customers."
Impacting Serv-U versions 15.2.3 HF1 and before, a successful exploitation of the shortcoming (CVE-2021-35211) could enable an adversary to run arbitrary code on the infected system, including the ability to install malicious programs and view, change, or delete sensitive data.
As indicators of compromise, the company is urging administrators to watch out for potentially suspicious connections via SSH from the IP addresses 98[.]176.196.89 and 68[.]235.178.32, or via TCP 443 from the IP address 208[.]113.35.58. Disabling SSH access on the Serv-U installation also prevents compromise.
The issue has been addressed in Serv-U version 15.2.3 hotfix (HF) 2.
SolarWinds also stressed in its advisory that the vulnerability is "completely unrelated to the SUNBURST supply chain attack" and that it does not affect other products, notably the Orion Platform, which was exploited to drop malware and dig deeper into the targeted networks by suspected Russian hackers to spy on multiple federal agencies and businesses in one of the most serious security breaches in U.S. history.
A string of software supply chain attacks since then has highlighted the fragility of modern networks and the sophistication of threat actors to identify hard-to-find vulnerabilities in widely-used software to conduct espionage and drop ransomware, in which hackers shut down the systems of business and demand payment to allow them to regain control.
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Text extracted automatically; images, tables and formatting may be missing. Original: https://thehackernews.com/2021/07/a-new-critical-solarwinds-zero-day.html