Cisco NX-OS TACACS+/RADIUS input validation flaw causing DoS via local attacker
CVE-2023-20168 Published on August 23, 2023
A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload. This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.
Vulnerability Analysis
CVE-2023-20168 is exploitable with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2023-20168 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2023-20168
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-20168 are published in Cisco Nx Os:
Affected Versions
Cisco NX-OS Software:- Version 4.2(1)SV1(4) is affected.
- Version 4.2(1)SV1(4a) is affected.
- Version 4.2(1)SV1(4b) is affected.
- Version 4.2(1)SV1(5.1) is affected.
- Version 4.2(1)SV1(5.1a) is affected.
- Version 4.2(1)SV1(5.2) is affected.
- Version 4.2(1)SV1(5.2b) is affected.
- Version 4.2(1)SV2(1.1) is affected.
- Version 4.2(1)SV2(1.1a) is affected.
- Version 4.2(1)SV2(2.1) is affected.
- Version 4.2(1)SV2(2.1a) is affected.
- Version 4.2(1)SV2(2.2) is affected.
- Version 4.2(1)SV2(2.3) is affected.
- Version 5.2(1)SM1(5.1) is affected.
- Version 5.2(1)SM1(5.2) is affected.
- Version 5.2(1)SM1(5.2a) is affected.
- Version 5.2(1)SM1(5.2b) is affected.
- Version 5.2(1)SM1(5.2c) is affected.
- Version 5.2(1)SM3(1.1) is affected.
- Version 5.2(1)SM3(1.1a) is affected.
- Version 5.2(1)SM3(1.1b) is affected.
- Version 5.2(1)SM3(1.1c) is affected.
- Version 5.2(1)SM3(2.1) is affected.
- Version 5.2(1)SV3(1.4) is affected.
- Version 5.2(1)SV3(1.1) is affected.
- Version 5.2(1)SV3(1.3) is affected.
- Version 5.2(1)SV3(1.5a) is affected.
- Version 5.2(1)SV3(1.5b) is affected.
- Version 5.2(1)SV3(1.6) is affected.
- Version 5.2(1)SV3(1.10) is affected.
- Version 5.2(1)SV3(1.15) is affected.
- Version 5.2(1)SV3(2.1) is affected.
- Version 5.2(1)SV3(2.5) is affected.
- Version 5.2(1)SV3(2.8) is affected.
- Version 5.2(1)SV3(3.1) is affected.
- Version 5.2(1)SV3(1.2) is affected.
- Version 5.2(1)SV3(1.4b) is affected.
- Version 5.2(1)SV3(3.15) is affected.
- Version 5.2(1)SV3(4.1) is affected.
- Version 5.2(1)SV3(4.1a) is affected.
- Version 5.2(1)SV3(4.1b) is affected.
- Version 5.2(1)SV3(4.1c) is affected.
- Version 6.0(2)A3(1) is affected.
- Version 6.0(2)A3(2) is affected.
- Version 6.0(2)A3(4) is affected.
- Version 6.0(2)A4(1) is affected.
- Version 6.0(2)A4(2) is affected.
- Version 6.0(2)A4(3) is affected.
- Version 6.0(2)A4(4) is affected.
- Version 6.0(2)A4(5) is affected.
- Version 6.0(2)A4(6) is affected.
- Version 6.0(2)A6(1) is affected.
- Version 6.0(2)A6(1a) is affected.
- Version 6.0(2)A6(2) is affected.
- Version 6.0(2)A6(2a) is affected.
- Version 6.0(2)A6(3) is affected.
- Version 6.0(2)A6(3a) is affected.
- Version 6.0(2)A6(4) is affected.
- Version 6.0(2)A6(4a) is affected.
- Version 6.0(2)A6(5) is affected.
- Version 6.0(2)A6(5a) is affected.
- Version 6.0(2)A6(5b) is affected.
- Version 6.0(2)A6(6) is affected.
- Version 6.0(2)A6(7) is affected.
- Version 6.0(2)A6(8) is affected.
- Version 6.0(2)A7(1) is affected.
- Version 6.0(2)A7(1a) is affected.
- Version 6.0(2)A7(2) is affected.
- Version 6.0(2)A7(2a) is affected.
- Version 6.0(2)A8(1) is affected.
- Version 6.0(2)A8(2) is affected.
- Version 6.0(2)A8(3) is affected.
- Version 6.0(2)A8(4) is affected.
- Version 6.0(2)A8(4a) is affected.
- Version 6.0(2)A8(5) is affected.
- Version 6.0(2)A8(6) is affected.
- Version 6.0(2)A8(7) is affected.
- Version 6.0(2)A8(7a) is affected.
- Version 6.0(2)A8(7b) is affected.
- Version 6.0(2)A8(8) is affected.
- Version 6.0(2)A8(9) is affected.
- Version 6.0(2)A8(10a) is affected.
- Version 6.0(2)A8(10) is affected.
- Version 6.0(2)A8(11) is affected.
- Version 6.0(2)A8(11a) is affected.
- Version 6.0(2)A8(11b) is affected.
- Version 6.0(2)U2(1) is affected.
- Version 6.0(2)U2(2) is affected.
- Version 6.0(2)U2(3) is affected.
- Version 6.0(2)U2(4) is affected.
- Version 6.0(2)U2(5) is affected.
- Version 6.0(2)U2(6) is affected.
- Version 6.0(2)U3(1) is affected.
- Version 6.0(2)U3(2) is affected.
- Version 6.0(2)U3(3) is affected.
- Version 6.0(2)U3(4) is affected.
- Version 6.0(2)U3(5) is affected.
- Version 6.0(2)U3(6) is affected.
- Version 6.0(2)U3(7) is affected.
- Version 6.0(2)U3(8) is affected.
- Version 6.0(2)U3(9) is affected.
- Version 6.0(2)U4(1) is affected.
- Version 6.0(2)U4(2) is affected.
- Version 6.0(2)U4(3) is affected.
- Version 6.0(2)U4(4) is affected.
- Version 6.0(2)U5(1) is affected.
- Version 6.0(2)U5(2) is affected.
- Version 6.0(2)U5(3) is affected.
- Version 6.0(2)U5(4) is affected.
- Version 6.0(2)U6(1) is affected.
- Version 6.0(2)U6(2) is affected.
- Version 6.0(2)U6(3) is affected.
- Version 6.0(2)U6(4) is affected.
- Version 6.0(2)U6(5) is affected.
- Version 6.0(2)U6(6) is affected.
- Version 6.0(2)U6(7) is affected.
- Version 6.0(2)U6(8) is affected.
- Version 6.0(2)U6(1a) is affected.
- Version 6.0(2)U6(2a) is affected.
- Version 6.0(2)U6(3a) is affected.
- Version 6.0(2)U6(4a) is affected.
- Version 6.0(2)U6(5a) is affected.
- Version 6.0(2)U6(5b) is affected.
- Version 6.0(2)U6(5c) is affected.
- Version 6.0(2)U6(9) is affected.
- Version 6.0(2)U6(10) is affected.
- Version 6.2(2) is affected.
- Version 6.2(2a) is affected.
- Version 6.2(6) is affected.
- Version 6.2(6b) is affected.
- Version 6.2(8) is affected.
- Version 6.2(8a) is affected.
- Version 6.2(8b) is affected.
- Version 6.2(10) is affected.
- Version 6.2(12) is affected.
- Version 6.2(18) is affected.
- Version 6.2(16) is affected.
- Version 6.2(14) is affected.
- Version 6.2(6a) is affected.
- Version 6.2(20) is affected.
- Version 6.2(1) is affected.
- Version 6.2(3) is affected.
- Version 6.2(5) is affected.
- Version 6.2(5a) is affected.
- Version 6.2(5b) is affected.
- Version 6.2(7) is affected.
- Version 6.2(9) is affected.
- Version 6.2(9a) is affected.
- Version 6.2(9b) is affected.
- Version 6.2(9c) is affected.
- Version 6.2(11) is affected.
- Version 6.2(11b) is affected.
- Version 6.2(11c) is affected.
- Version 6.2(11d) is affected.
- Version 6.2(11e) is affected.
- Version 6.2(13) is affected.
- Version 6.2(13a) is affected.
- Version 6.2(13b) is affected.
- Version 6.2(15) is affected.
- Version 6.2(17) is affected.
- Version 6.2(19) is affected.
- Version 6.2(21) is affected.
- Version 6.2(23) is affected.
- Version 6.2(20a) is affected.
- Version 6.2(25) is affected.
- Version 6.2(22) is affected.
- Version 6.2(27) is affected.
- Version 6.2(29) is affected.
- Version 6.2(24) is affected.
- Version 6.2(31) is affected.
- Version 6.2(24a) is affected.
- Version 6.2(33) is affected.
- Version 7.0(3)F1(1) is affected.
- Version 7.0(3)F2(1) is affected.
- Version 7.0(3)F2(2) is affected.
- Version 7.0(3)F3(1) is affected.
- Version 7.0(3)F3(2) is affected.
- Version 7.0(3)F3(3) is affected.
- Version 7.0(3)F3(3a) is affected.
- Version 7.0(3)F3(4) is affected.
- Version 7.0(3)F3(3c) is affected.
- Version 7.0(3)F3(5) is affected.
- Version 7.0(3)I2(2a) is affected.
- Version 7.0(3)I2(2b) is affected.
- Version 7.0(3)I2(2c) is affected.
- Version 7.0(3)I2(2d) is affected.
- Version 7.0(3)I2(2e) is affected.
- Version 7.0(3)I2(3) is affected.
- Version 7.0(3)I2(4) is affected.
- Version 7.0(3)I2(5) is affected.
- Version 7.0(3)I2(1) is affected.
- Version 7.0(3)I2(1a) is affected.
- Version 7.0(3)I2(2) is affected.
- Version 7.0(3)I3(1) is affected.
- Version 7.0(3)I4(1) is affected.
- Version 7.0(3)I4(2) is affected.
- Version 7.0(3)I4(3) is affected.
- Version 7.0(3)I4(4) is affected.
- Version 7.0(3)I4(5) is affected.
- Version 7.0(3)I4(6) is affected.
- Version 7.0(3)I4(7) is affected.
- Version 7.0(3)I4(8) is affected.
- Version 7.0(3)I4(8a) is affected.
- Version 7.0(3)I4(8b) is affected.
- Version 7.0(3)I4(8z) is affected.
- Version 7.0(3)I4(9) is affected.
- Version 7.0(3)I5(1) is affected.
- Version 7.0(3)I5(2) is affected.
- Version 7.0(3)I6(1) is affected.
- Version 7.0(3)I6(2) is affected.
- Version 7.0(3)I7(1) is affected.
- Version 7.0(3)I7(2) is affected.
- Version 7.0(3)I7(3) is affected.
- Version 7.0(3)I7(4) is affected.
- Version 7.0(3)I7(5) is affected.
- Version 7.0(3)I7(5a) is affected.
- Version 7.0(3)I7(6) is affected.
- Version 7.0(3)I7(7) is affected.
- Version 7.0(3)I7(8) is affected.
- Version 7.0(3)I7(9) is affected.
- Version 7.0(3)I7(10) is affected.
- Version 7.1(0)N1(1a) is affected.
- Version 7.1(0)N1(1b) is affected.
- Version 7.1(0)N1(1) is affected.
- Version 7.1(1)N1(1) is affected.
- Version 7.1(2)N1(1) is affected.
- Version 7.1(3)N1(1) is affected.
- Version 7.1(3)N1(2) is affected.
- Version 7.1(4)N1(1) is affected.
- Version 7.1(5)N1(1) is affected.
- Version 7.1(5)N1(1b) is affected.
- Version 7.2(0)D1(1) is affected.
- Version 7.2(1)D1(1) is affected.
- Version 7.2(2)D1(2) is affected.
- Version 7.2(2)D1(1) is affected.
- Version 7.3(0)D1(1) is affected.
- Version 7.3(0)DX(1) is affected.
- Version 7.3(0)DY(1) is affected.
- Version 7.3(0)N1(1) is affected.
- Version 7.3(1)D1(1) is affected.
- Version 7.3(1)DY(1) is affected.
- Version 7.3(1)N1(1) is affected.
- Version 7.3(2)D1(1) is affected.
- Version 7.3(2)D1(2) is affected.
- Version 7.3(2)D1(3) is affected.
- Version 7.3(2)D1(3a) is affected.
- Version 7.3(2)N1(1) is affected.
- Version 7.3(3)N1(1) is affected.
- Version 8.0(1) is affected.
- Version 8.1(1) is affected.
- Version 8.1(2) is affected.
- Version 8.1(2a) is affected.
- Version 8.1(1a) is affected.
- Version 8.1(1b) is affected.
- Version 8.2(1) is affected.
- Version 8.2(2) is affected.
- Version 8.2(3) is affected.
- Version 8.2(4) is affected.
- Version 8.2(5) is affected.
- Version 8.2(6) is affected.
- Version 8.2(7) is affected.
- Version 8.2(7a) is affected.
- Version 8.2(8) is affected.
- Version 8.2(9) is affected.
- Version 8.3(1) is affected.
- Version 8.3(2) is affected.
- Version 9.2(1) is affected.
- Version 9.2(2) is affected.
- Version 9.2(2t) is affected.
- Version 9.2(3) is affected.
- Version 9.2(4) is affected.
- Version 9.2(2v) is affected.
- Version 9.2(1a) is affected.
- Version 7.3(4)N1(1) is affected.
- Version 7.3(3)D1(1) is affected.
- Version 7.3(4)D1(1) is affected.
- Version 7.3(5)N1(1) is affected.
- Version 5.2(1)SK3(1.1) is affected.
- Version 5.2(1)SK3(2.1) is affected.
- Version 5.2(1)SK3(2.2) is affected.
- Version 5.2(1)SK3(2.2b) is affected.
- Version 5.2(1)SK3(2.1a) is affected.
- Version 5.2(1)SV5(1.1) is affected.
- Version 5.2(1)SV5(1.2) is affected.
- Version 5.2(1)SV5(1.3) is affected.
- Version 5.2(1)SV5(1.3a) is affected.
- Version 5.2(1)SV5(1.3b) is affected.
- Version 5.2(1)SV5(1.3c) is affected.
- Version 8.4(1) is affected.
- Version 8.4(1a) is affected.
- Version 8.4(2) is affected.
- Version 8.4(2a) is affected.
- Version 8.4(3) is affected.
- Version 8.4(2b) is affected.
- Version 8.4(4) is affected.
- Version 8.4(2c) is affected.
- Version 8.4(4a) is affected.
- Version 8.4(5) is affected.
- Version 8.4(2d) is affected.
- Version 8.4(6) is affected.
- Version 8.4(2e) is affected.
- Version 8.4(6a) is affected.
- Version 8.4(7) is affected.
- Version 8.4(2f) is affected.
- Version 9.3(1) is affected.
- Version 9.3(2) is affected.
- Version 9.3(3) is affected.
- Version 9.3(4) is affected.
- Version 9.3(5) is affected.
- Version 9.3(6) is affected.
- Version 9.3(7) is affected.
- Version 9.3(7a) is affected.
- Version 9.3(8) is affected.
- Version 9.3(9) is affected.
- Version 9.3(10) is affected.
- Version 9.3(11) is affected.
- Version 7.3(6)N1(1) is affected.
- Version 7.3(5)D1(1) is affected.
- Version 7.3(7)N1(1) is affected.
- Version 7.3(7)N1(1a) is affected.
- Version 7.3(7)N1(1b) is affected.
- Version 7.3(6)D1(1) is affected.
- Version 7.3(8)N1(1) is affected.
- Version 7.3(7)D1(1) is affected.
- Version 7.3(9)N1(1) is affected.
- Version 10.1(1) is affected.
- Version 10.1(2) is affected.
- Version 10.1(2t) is affected.
- Version 8.5(1) is affected.
- Version 7.3(10)N1(1) is affected.
- Version 7.3(8)D1(1) is affected.
- Version 10.2(1) is affected.
- Version 10.2(1q) is affected.
- Version 10.2(2) is affected.
- Version 10.2(3) is affected.
- Version 10.2(3t) is affected.
- Version 10.2(4) is affected.
- Version 10.2(5) is affected.
- Version 7.3(9)D1(1) is affected.
- Version 7.3(11)N1(1) is affected.
- Version 7.3(12)N1(1) is affected.
- Version 10.3(1) is affected.
- Version 10.3(2) is affected.
- Version 7.3(13)N1(1) is affected.
Exploit Probability
EPSS
0.11%
Percentile
29.12%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.