Cisco security devices targeted with CVE-2020-3580 PoC exploit
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2020-3580 | Cross-Site Scripting in Cisco ASA and FTD Web Services Interface CVE-2020-3580 is a cross-site scripting (XSS) flaw caused by insufficient validation of user-supplied input in the web services interface of Cisco ASA and Firepower Threat Defense (FTD) software. An unauthenticated, remote attacker can exploit it by persuading a user of the web interface to click a crafted link, which then executes arbitrary script code in the context of the interface or exposes sensitive browser-based information such as session data. Only devices running specific AnyConnect and WebVPN configurations are affected, so not every ASA/FTD deployment is vulnerable. The flaw is under active exploitation: it is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03) with known ransomware use, a public PoC exploit has driven scanning, and groups such as Akira and LockBit are actively searching for vulnerable Cisco ASA devices. Do: Apply updates per the vendor's instructions (Cisco's advisory lists the fixed ASA/FTD releases), prioritizing internet-facing devices since ransomware operators (Akira, LockBit) are actively scanning. Check whether the web services interface (AnyConnect/WebVPN) is enabled, as only those configurations are vulnerable, and restrict internet access to the device's management/web interface where possible. Treat as urgent given its KEV listing and known ransomware use. | 6.1 | 86% | KEV ransomware |
| mass≈100,000–1,000,000 internet-exposed ASA/FTD appliances (Cisco ASA is among the most commonly exposed edge firewall/VPN platforms in public internet scans) | |
| CVE-2020-3581 | Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software cou Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section. NVD description · AI analysis pending | 6.1 | 1% |
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Full article322 words · extracted from helpnetsecurity.com · click to collapse
Attackers and bug hunters are leveraging an exploit for CVE-2020-3580 to compromise vulnerable security devices running Cisco ASA or FTD software.
Active attacks apparently started after Positive Technologies researchers shared proof-of-concept (PoC) exploit code last Thursday via Twitter.
🎁PoC for XSS in Cisco ASA (CVE-2020-3580)
POST /+CSCOE+/saml/sp/acs?tgname=a HTTP/1.1
Host: ciscoASA.local
Content-Type: application/x-www-form-urlencoded
Content-Length: 44SAMLResponse="><svg/onload=alert('PTSwarm')> pic.twitter.com/c53MKSK9bg
— PT SWARM (@ptswarm) June 24, 2021
About CVE-2020-3580
CVE-2020-3580 was patched by Cisco in October 2020, alonside three additional pre-authentication cross-site scripting (XSS) flaws: CVE-2020-3581, CVE-2020-3582, and CVE-2020-3583.
In April 2021, Cisco released new software updates because the fix for CVE-2020-3581 was incomplete.
The source of all four vulnerabilities was insufficient validation of user-supplied input by the web services interface of an affected device, and could be exploited by attackers who manage to trick or persuade a user of the interface to click a crafted link.
The vulnerabilities are deemed to be of medium severity even though they are remotely exploitable without authentication. The reasons for this moderate severity rating are several: exploitation requires user interaction, and could ultimately “only” lead to executed arbitrary script code in the context of the interface or provide the attackers with access to sensitive, browser-based information.
Active attacks using the CVE-2020-3580 PoC exploit
Nine months have passed since CVE-2020-3580 was fixed, and Positive Technologies researchers were apparently confident that enough organizations have implemented the security updates and that releasing the PoC exploit code would not be widely damaging.
But, according to Tenable, attackers have started actively exploiting CVE-2020-3580 in the wild. Also, according to Positive Technologies researcher Mikhail Klyuchnikov, they are not the only ones:
The hunt for low hanging CVE-2020-3580 by @ptswarm has begun.
A lot of submissions/duplicates are waiting for @Bugcrowd and @Hacker0x01 #bugbounty— n1 (@__mn1__) June 24, 2021
Organizations that have been slow to implement the offered security updates are urged to do so now. Cisco’s updated security advisory can serve as a guide.
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.helpnetsecurity.com/2021/06/29/cve-2020-3580-exploit/