CVE-2023-20135 Race condition in Cisco IOS XR Software
An authenticated local attacker can execute arbitrary code on Cisco IOS XR devices by exploiting a race condition during ISO image installation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-20135?
CVE-2023-20135 is a medium-severity vulnerability in Cisco Ios Xr, published on 13 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.
Which versions are affected by CVE-2023-20135?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2023-20135?
No fix has been published for CVE-2023-20135 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-20135 being exploited?
There is no known exploitation of CVE-2023-20135 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xr
- CVE-2020-3118 Cisco IOS XR Software Discovery Protocol Format String
- CVE-2020-3569 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2020-3566 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2010-3035 Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service
- CVE-2022-20821 Cisco IOS XR Open Port
Sources
Also known as GHSA-6v48-qpg5-fj4m.