Technology giant Cisco on Wednesday released its semiannual FXOS and NX-OS security advisory bundle with information on four vulnerabilities, including two high-severity flaws in NX-OS software.
The first of the high-severity bugs, CVE-2024-20321, exists because External Border Gateway Protocol (eBGP) traffic “is mapped to a shared hardware rate-limiter queue”, allowing an unauthenticated, remote attacker to send large amounts of traffic and cause a denial-of-service (DoS) condition.
According to Cisco, under certain conditions, the security defect impacts Nexus 3600 series switches and Nexus 9500 R-series line cards, including the following product IDs: N3K-C36180YC-R, N3K-C3636C-R, N9K-X9624D-R2, N9K-X9636C-R, N9K-X9636C-RX, N9K-X9636Q-R, and N9K-X96136YC-R.
The second issue, tracked as CVE-2024-20267, exists because processing an ingress MPLS frame lacked proper error checking. An unauthenticated, remote attacker could encapsulate a crafted IPv6 packet in an MPLS frame and send it to a vulnerable device to cause a DoS condition.
The issue impacts Nexus 3000, Nexus 5500, Nexus 5600, Nexus 6000, Nexus 7000, and Nexus 9000 series switches that have MPLS configured.
NX-OS software versions 9.3(12), 10.2(6), and 10.3(4a) resolve these vulnerabilities.
On Wednesday, Cisco also announced patches for two medium-severity flaws impacting its FXOS and NX-OS software.
The first affects the handling of specific fields in a Link Layer Discovery Protocol (LLDP) frame and could allow an attacker to crash the LLDP service on the affected device.
The second bug was found in the access control list (ACL) programming for port channel subinterfaces of Nexus 3000 and 9000 series switches in standalone NX-OS mode and could be exploited remotely, without authentication, to bypass ACL protections.
A fifth issue resolved on Wednesday impacts the UCS 6400 and 6500 series fabric interconnects in Intersight Managed Mode (IMM). Also a medium-severity vulnerability, it could be exploited by unauthenticated, remote attackers to cause a DoS condition.
Cisco says it is not aware of any of these security defects being exploited in attacks. Additional information can be found on Cisco’s security advisories page.
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