Barracuda Warns of Zero-Day Exploited to Breach Email Security Gateway Appliances
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2023-2868 | Unauthenticated Command Injection in Barracuda Email Security Gateway Appliances via .tar Files CVE-2023-2868 is a critical (CVSS 9.8) remote command injection vulnerability in the Barracuda Email Security Gateway (ESG) appliance form factor (models 300, 400, 600, 800 and 900), caused by incomplete input validation of user-supplied .tar archives, specifically the names of the files contained within them. An attacker can deliver a specially crafted .tar file whose internal file names are formatted so that, when the ESG processes the archive, commands are executed through Perl's qx operator. Successful exploitation yields remote command execution with the privileges of the ESG product, and in the observed campaign attackers deployed a backdoor (reported as "SUBMARINE") and persisted on compromised appliances. Only customers running ESG appliances on versions 5.1.3.001 through 9.2.0.006 are affected. Exploitation is confirmed in the wild — CISA added it to the KEV on 2023-05-26, EPSS puts 30-day exploitation probability at 87.7%, and public reporting attributes active exploitation to a Chinese-nexus espionage group (associated in headlines with Salt Typhoon) targeting government, military, and telecom victims; Barracuda's BNSF-36456 patch was applied automatically to customer appliances. Do: Verify that each ESG appliance received the automatic BNSF-36456 patch (running fixed firmware at or above 9.2.0.006's successor per vendor instructions), and check appliances for indicators of compromise, including unauthorized command activity and the "SUBMARINE" backdoor, using Barracuda's IOC guidance. Because the espionage campaign established persistence, Barracuda urged full replacement rather than patching of compromised appliances; replace any ESG showing signs of compromise and review email logs for malicious .tar attachments. Limit or monitor internet exposure of ESG management interfaces while remediation proceeds. | 9.8 | 88% | KEV |
| largetens of thousands of deployed ESG appliances (public scans show Barracuda ESGs among commonly internet-exposed email security devices); Barracuda's incident… |
Indicators of compromiseauto-extracted · verify before use · export allAll →
| Type | Indicator | Context |
|---|---|---|
| ipv4 | 5.1.3.001 | as a remote code injection vulnerability affecting versions 5.1.3.001 through 9.2.0.006. The California-headquartered firm said t |
Full article474 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananMay 26, 2023Email Security / Zero-Day
Email protection and network security services provider Barracuda is warning users about a zero-day flaw that it said has been exploited to breach the company's Email Security Gateway (ESG) appliances.
The zero-day is being tracked as CVE-2023-2868 and has been described as a remote code injection vulnerability affecting versions 5.1.3.001 through 9.2.0.006.
The California-headquartered firm said the issue is rooted in a component that screens the attachments of incoming emails.
"The vulnerability arises out of a failure to comprehensively sanitize the processing of .tar file (tape archives)," according to an advisory from the NIST's national vulnerability database.
"The vulnerability stems from incomplete input validation of a user-supplied .tar file as it pertains to the names of the files contained within the archive. As a consequence, a remote attacker can specifically format these file names in a particular manner that will result in remotely executing a system command through Perl's qx operator with the privileges of the Email Security Gateway product."
The shortcoming, Barracuda noted, was identified on May 19, 2023, prompting the company to deploy a patch across all ESG devices worldwide a day later. A second fix was released on May 21 as part of its "containment strategy."
Additionally, the company's investigation uncovered evidence of active exploitation of CVE-2023-2868, resulting in unauthorized access to a "subset of email gateway appliances."
The company, which has over 200,000 global customers, did not disclose the scale of the attack. It said affected users have been directly contacted with a list of remedial actions to take.
Barracuda has also urged its customers to review their environments, adding it's still actively monitoring the situation.
The identity of the threat actors behind the attack is currently not known, but Chinese and Russian hacking groups have been observed deploying bespoke malware on vulnerable Cisco, Fortinet, and SonicWall devices in recent months.
The development comes as Defiant alerted of large-scale exploitation of a now-fixed cross-site scripting (XSS) flaw in a plugin called Beautiful Cookie Consent Banner (CVSS score: 7.2) that's installed on over 40,000 sites.
The vulnerability offers unauthenticated attackers the ability to inject malicious JavaScript to a website, potentially allowing redirects to malvertising sites as well as the creation of rogue admin users, resulting in site takeovers.
The WordPress security company said it "blocked nearly 3 million attacks against more than 1.5 million sites, from nearly 14,000 IP addresses since May 23, 2023, and attacks are ongoing."
Update
The U.S. Cybersecurity and Infrastructure Security Agency on Friday added the remote code injection vulnerability impacting Barracuda ESG appliances to its Known Exploited Vulnerabilities (KEV) catalog, urging federal agencies to apply the fixes by June 16, 2023.
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