7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
34.6%
A vulnerability in the installer component of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated local attacker to copy user-supplied files to system level directories with system level privileges. The vulnerability is due to the incorrect handling of directory paths. An attacker could exploit this vulnerability by creating a malicious file and copying the file to a system directory. An exploit could allow the attacker to copy malicious files to arbitrary locations with system level privileges. This could include DLL pre-loading, DLL hijacking, and other related attacks. To exploit this vulnerability, the attacker needs valid credentials on the Windows system.
Recent assessments:
cdelafuente-r7 at June 25, 2020 9:43am UTC reported:
The installer component of Cisco AnyConnect Secure Mobility Client for Windows prior to 4.8.02042 is vulnerable to path traversal and allows local attackers to create/overwrite files in arbitrary locations as the SYSTEM user. By successfully exploiting this flaw, a local attacker will be able to execute arbitrary commands with elevated privileges and take full control of the system.
This write-up provides some additional information about practical exploitation than the original advisory. Basically, the attack consists of sending a specially crafted IPC message to the TCP port 62522 on the loopback device, which is exposed by the Cisco AnyConnect Secure Mobility Agent service. This service will then launch the vulnerable installer component (vpndownloader
), which copies itself to an arbitrary location before being executed with SYSTEM user privileges. Combining this flaw with DLL hijacking technique, it is possible to execute arbitrary code in the context of the SYSTEM user.
Since two PoC’s (here and here ) and a weaponized Metasploit module are now available, it is highly recommended to update AnyConnect.
cnotin at April 22, 2020 8:32am UTC reported:
The installer component of Cisco AnyConnect Secure Mobility Client for Windows prior to 4.8.02042 is vulnerable to path traversal and allows local attackers to create/overwrite files in arbitrary locations as the SYSTEM user. By successfully exploiting this flaw, a local attacker will be able to execute arbitrary commands with elevated privileges and take full control of the system.
This write-up provides some additional information about practical exploitation than the original advisory. Basically, the attack consists of sending a specially crafted IPC message to the TCP port 62522 on the loopback device, which is exposed by the Cisco AnyConnect Secure Mobility Agent service. This service will then launch the vulnerable installer component (vpndownloader
), which copies itself to an arbitrary location before being executed with SYSTEM user privileges. Combining this flaw with DLL hijacking technique, it is possible to execute arbitrary code in the context of the SYSTEM user.
Since two PoC’s (here and here ) and a weaponized Metasploit module are now available, it is highly recommended to update AnyConnect.
Assessed Attacker Value: 4
Assessed Attacker Value: 4Assessed Attacker Value: 5
packetstormsecurity.com/files/157340/Cisco-AnyConnect-Secure-Mobility-Client-4.8.01090-Privilege-Escalation.html
packetstormsecurity.com/files/158219/Cisco-AnyConnect-Path-Traversal-Privilege-Escalation.html
packetstormsecurity.com/files/159420/Cisco-AnyConnect-Privilege-Escalation.html
seclists.org/fulldisclosure/2020/Apr/43
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3153
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ac-win-path-traverse-qO4HWBsj
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
34.6%