A vulnerability in the interprocess communication (IPC) channel of Cisco AnyConnect Secure Mobility Client Software could allow an authenticated, local attacker to cause a targeted AnyConnect user to execute a malicious script. The vulnerability is due to a lack of authentication to the IPC listener. An attacker could exploit this vulnerability by sending crafted IPC messages to the AnyConnect client IPC listener. A successful exploit could allow an attacker to cause the targeted AnyConnect user to execute a script. This script would execute with the privileges of the targeted AnyConnect user. In order to successfully exploit this vulnerability, there must be an ongoing AnyConnect session by the targeted user at the time of the attack. To exploit this vulnerability, the attacker would also need valid user credentials on the system upon which the AnyConnect client is being run. Cisco has not released software updates that address this vulnerability.
Published 2020-11-06 19:15:15
Updated 2020-11-20 16:54:36
View at NVD,   CVE.org
Vulnerability category: Input validation

Products affected by CVE-2020-3556

Exploit prediction scoring system (EPSS) score for CVE-2020-3556

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-3556

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.4
MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:P
3.4
6.4
NIST
7.3
HIGH CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
1.3
5.9
Cisco Systems, Inc.
7.3
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
1.3
5.9
NIST

CWE ids for CVE-2020-3556

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2020-3556

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