Cisco has issued a safety advisory concerning a crucial distant code execution (RCE) vulnerability, dubbed “regreSSHion,” that impacts a number of merchandise.
The vulnerability tracked as CVE-2024-6387, was disclosed by the Qualys Risk Analysis Unit on July 1, 2024. It impacts the OpenSSH server (sshd) in glibc-based Linux techniques and has the potential to permit unauthenticated attackers to realize root entry to affected techniques.
Vulnerability Particulars
The regreSSHion vulnerability is a regression of an older flaw (CVE-2006-5051) that was reintroduced in OpenSSH model 8.5p1, launched in October 2020.
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The flaw entails a race situation within the sshd’s SIGALRM handler, which calls features that aren’t async-signal-safe, corresponding to syslog()
.
An attacker can exploit this by opening a number of connections and failing to authenticate throughout the LoginGraceTime interval, triggering the susceptible sign handler asynchronously.
Cisco has recognized a number of merchandise throughout varied classes affected by this vulnerability.
The corporate is actively investigating its product line to find out the complete scope of impacted gadgets. The next desk lists the affected merchandise and their respective Cisco Bug IDs:
Product Class | Product Identify | Cisco Bug ID | Fastened Launch Availability |
---|---|---|---|
Community and Content material Safety Units | Adaptive Safety Equipment (ASA) Software program | CSCwk61618 | |
Firepower Administration Heart (FMC) Software program | CSCwk61618 | ||
Firepower Risk Protection (FTD) Software program | CSCwk61618 | ||
FXOS Firepower Chassis Supervisor | CSCwk62297 | ||
Identification Providers Engine (ISE) | CSCwk61938 | ||
Safe Community Analytics | CSCwk62315 | ||
Community Administration and Provisioning | Crosswork Information Gateway | CSCwk62311 | 7.0.0 (Aug 2024) |
Cyber Imaginative and prescient | CSCwk62289 | ||
DNA Areas Connector | CSCwk62273 | ||
Prime Infrastructure | CSCwk62276 | ||
Good Software program Supervisor On-Prem | CSCwk62288 | ||
Virtualized Infrastructure Supervisor | CSCwk62277 | ||
Routing and Switching – Enterprise and Service Supplier | ASR 5000 Sequence Routers | CSCwk62248 | |
Nexus 3000 Sequence Switches | CSCwk61235 | ||
Nexus 9000 Sequence Switches in standalone NX-OS mode | CSCwk61235 | ||
Unified Computing | Intersight Digital Equipment | CSCwk63145 | |
Voice and Unified Communications Units | Emergency Responder | CSCwk63694 | |
Unified Communications Supervisor | CSCwk62318 | ||
Unified Communications Supervisor IM & Presence Service | CSCwk63634 | ||
Unity Connection | CSCwk63494 | ||
Video, Streaming, TelePresence, and Transcoding Units | Cisco Assembly Server | CSCwk62286 | SMU – CMS 3.9.2 (Aug 2024) |
Mitigation and Suggestions
Cisco recommends a number of steps to mitigate the chance of exploitation:
- Prohibit SSH Entry: Restrict SSH entry to trusted hosts solely. This may be achieved by making use of infrastructure entry management lists (ACLs) to forestall unauthorized entry to SSH providers.
- Improve OpenSSH: Improve to the most recent patched model of OpenSSH (9.8p1) as quickly because it turns into obtainable within the package deal repositories of Linux distributions.
- Regulate LoginGraceTime: Set the
LoginGraceTime
parameter to 0 within the sshd configuration file to forestall the race situation, though this may occasionally result in denial-of-service if all connection slots develop into occupied[1][6][7].
The Cisco Product Safety Incident Response Crew (PSIRT) is aware of {that a} proof-of-concept exploit code is on the market for this vulnerability. Nonetheless, the exploitation requires customization, and there have been no experiences of malicious use.
Cisco continues to evaluate all services for impression and can replace the advisory as new data turns into obtainable.
The regreSSHion vulnerability poses a big danger to a variety of Cisco merchandise.
Prospects are urged to observe Cisco’s suggestions and apply the required patches and mitigations to guard their techniques from potential exploitation.
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