Pexip security bulletins

The following security bulletins are issued by Pexip.

Each bulletin addresses a number of vulnerabilities in the operating system software used by Pexip Infinity. The bulletins include an assessment of the issues, the impact to the Pexip Infinity platform, and resolution details.

Please contact your Pexip authorized support representative for more information about these issues. For issues addressed in 2018 and earlier, see our documentation for previous releases.

More information specific for each of the vulnerabilities can be found via the NIST National Vulnerability Database: http://nvd.nist.gov/.

Bulletin	Description	Risk	Updated	Addressed in version
CVE-2021-31925	Incomplete input validation in the administrative web interface allows an unauthenticated remote attacker to cause a denial of service.	High	May 2021	25.4
CVE-2021-3156	Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.	Low	February 2021	25.1
CVE-2020-25705	A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. Resolved minor issues: CVE-2017-18258, CVE-2018-1152, CVE-2018-14404, CVE-2018-14498, CVE-2018-14567, CVE-2019-0146, CVE-2019-0147, CVE-2019-0148, CVE-2019-0149, CVE-2019-16168, CVE-2019-18808, CVE-2019-18885, CVE-2019-19036, CVE-2019-19039, CVE-2019-19054, CVE-2019-19067, CVE-2019-19072, CVE-2019-19073, CVE-2019-19082, CVE-2019-19462, CVE-2019-19813, CVE-2019-19956, CVE-2019-20388, CVE-2019-20806, CVE-2019-20810, CVE-2019-20811, CVE-2019-20812, CVE-2019-20934, CVE-2020-0305, CVE-2020-0427, CVE-2020-10177, CVE-2020-10378, CVE-2020-10711, CVE-2020-10732, CVE-2020-10751, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10769, CVE-2020-10781, CVE-2020-10878, CVE-2020-12049, CVE-2020-12352, CVE-2020-12656, CVE-2020-12723, CVE-2020-12768, CVE-2020-12771, CVE-2020-12797, CVE-2020-12826, CVE-2020-12888, CVE-2020-13143, CVE-2020-13434, CVE-2020-13435, CVE-2020-13632, CVE-2020-14308, CVE-2020-14309, CVE-2020-14310, CVE-2020-14311, CVE-2020-14314, CVE-2020-14331, CVE-2020-14344, CVE-2020-14363, CVE-2020-14381, CVE-2020-14385, CVE-2020-14390, CVE-2020-14416, CVE-2020-14422, CVE-2020-15358, CVE-2020-15393, CVE-2020-15436, CVE-2020-15437, CVE-2020-15706, CVE-2020-15707, CVE-2020-15999, CVE-2020-16166, CVE-2020-1968, CVE-2020-1971, CVE-2020-25211, CVE-2020-25284, CVE-2020-25285, CVE-2020-25641, CVE-2020-25656, CVE-2020-25704, CVE-2020-26088, CVE-2020-27675, CVE-2020-28196, CVE-2020-28915, CVE-2020-28974, CVE-2020-29368, CVE-2020-29370, CVE-2020-29371, CVE-2020-7595, CVE-2020-7955, CVE-2020-8492, CVE-2020-8619, CVE-2020-8622, CVE-2020-8624, CVE-2020-8694	High	January 2021	25
CVE-2020-25868	Insufficient input validation in the in call setup implementation allows an unauthenticated remote attacker to cause a software abort leading to a temporary loss of service.	High	October 2020	24.2
CVE-2020-24615	Bulletin addresses insufficient input validation in the SIP protocol implementation that allows an unauthenticated remote attacker to cause a software abort leading to a temporary loss of service.	High	August 2020	24.1
CVE-2020-4067	Bulletin addresses Coturn not initializing the STUN/TURN response buffer properly, allowing an attacker to extract information from the connection of another client. Minor issues resolved in Pexip Infinity 24: CVE-2019-3016, CVE-2019-5108, CVE-2019-5436, CVE-2019-5481, CVE-2019-5482, CVE-2019-14615, CVE-2019-15217, CVE-2019-18197, CVE-2019-19046, CVE-2019-19051, CVE-2019-19056, CVE-2019-19058, CVE-2019-19059, CVE-2019-19066, CVE-2019-19068, CVE-2019-19768, CVE-2019-20636, CVE-2020-1749, CVE-2020-2732, CVE-2020-3810, CVE-2020-8428, CVE-2020-8616, CVE-2020-8617, CVE-2020-8647, CVE-2020-8648, CVE-2020-8649, CVE-2020-10531, CVE-2020-10942, CVE-2020-11494, CVE-2020-11565, CVE-2020-11608, CVE-2020-11609, CVE-2020-12114, CVE-2020-12243, CVE-2020-12464, CVE-2020-12465, CVE-2020-12652, CVE-2020-12657, CVE-2020-12659, CVE-2020-12769, CVE-2020-12770	High	July 2020	24
CVE-2020-13387	Bulletin addresses insufficient input validation in the H.323 protocol implementation that allows an unauthenticated remote attacker to cause a software abort leading to a temporary loss of service.	High	June 2020	23.4
CVE-2020-12824	Bulletin addresses insufficient input validation in the real-time transport protocol (RTP) implementation that allows an unauthenticated remote attacker to cause a controlled software abort leading to a temporary loss of service.	High	May 2020	23.3
CVE-2020-11805	Bulletin addresses insufficient input validation when the TURN server feature is enabled and configured to listen on port 443. This allows an unauthenticated remote attacker to send arbitrary UDP traffic to destinations on the same network segment as the Pexip Reverse Proxy and TURN Server.	Critical	April 2020	6.1.0
CVE-2020-11805	Bulletin addresses insufficient input validation in the "technology preview" TCP media relay feature that allows an unauthenticated remote attacker to send arbitrary UDP traffic to destinations on the same network segment as the Conferencing Node operating as a relay.	Critical	April 2020	23.2
CVE-2018-20843	Bulletin addresses a vulnerability in the Expat XML parser that could allow an attacker to cause a denial of service (excess CPU and memory consumption). Minor issues resolved in Pexip Infinity 22: CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843, CVE-2018-20855, CVE-2019-2101, CVE-2019-3498, CVE-2019-6975, CVE-2019-10638, CVE-2019-12735, CVE-2019-12749, CVE-2019-12984, CVE-2019-13233, CVE-2019-13272, CVE-2019-13631, CVE-2019-14283, CVE-2019-14284	High	September 2019	22
CVE-2016-10745	Bulletin addresses: In Pallets Jinja before 2.8.1, str.format allows a sandbox escape.	High	May 2019	21
CVE-201x	Bulletin addresses several vulnerabilities, including CVE-2019-7177, CVE-2019-7178.	Critical	Feb 15, 2019	20.1

CVE-2020-12824: Insufficient input validation in the real-time transport protocol (RTP) implementation allows an unauthenticated remote attacker to cause a controlled software abort leading to a temporary loss of service

Impact to Pexip Infinity: High

Affected versions of Pexip Infinity: 23, 23.1, 23.2

CVSS3.1 base score: 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Mitigation: None.

Resolution: Upgrade to Pexip Infinity 23.3

CVE-2020-11805: Insufficient input validation when the TURN server feature is enabled and configured to listen on port 443. This allows an unauthenticated remote attacker to send arbitrary UDP traffic to destinations on the same network segment as the Pexip Reverse Proxy and TURN Server

Impact to Pexip Reverse Proxy and TURN Server: Critical

Affected versions of Pexip Reverse Proxy and TURN Server: 6.0.7 and 6.0.10

CVSS3.1 base score: 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

Mitigation: The TURN server feature does not listen on port 443 by default. Deployments that have this functionality enabled should be reconfigured to disable this feature. As general good practice, deploy your Pexip Reverse Proxy and TURN Server in a DMZ — especially if using the TURN server feature in any capacity — and ensure that external firewalls are configured to forbid unexpected traffic between network segments.

Resolution: Upgrade to Pexip Reverse Proxy and TURN Server 6.1.0

CVE-2020-11805: Insufficient input validation in the "technology preview" TCP media relay feature allows an unauthenticated remote attacker to send arbitrary UDP traffic to destinations on the same network segment as the Conferencing Node operating as a relay

Impact to Pexip Infinity: Critical

Affected versions of Pexip Infinity: 23, 23.1

CVSS3.1 base score: 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

Mitigation: The TCP media relay feature is disabled by default. Deployments that have this functionality enabled (by navigating to Platform > Global settings > Tech preview features and selecting Enable media relay on TCP port 443) should be reconfigured to disable this feature. As general good practice, ensure that external firewalls are configured to forbid unexpected traffic between network segments.

Resolution: Upgrade to Pexip Infinity 23.2

CVE-2018-20843: A vulnerability in the Expat XML parser could allow an attacker to cause a denial of service (excess CPU and memory consumption)

Impact to Pexip Infinity: High

Affected versions of Pexip Infinity: All before 22

CVSS3 base score: 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Mitigation: Pexip Infinity uses the Expat XML parser only when configured for integration with external systems (such as CUCM Ad Hoc conferencing). This functionality is disabled in default configuration and must be configured explicitly by the system administrator. If integration with CUCM Ad Hoc conferencing is not required, ensure that this functionality is disabled by navigating to Platform > Global Settings > External system integration, clearing the External system username and External system password fields, and saving the settings. If integration with CUCM Ad Hoc conferencing is required, there is no mitigation available.

Resolution: Upgrade to Pexip Infinity 22

CVE-2016-10745 May 2019: In Pallets Jinja before 2.8.1, str.format allows a sandbox escape

Impact to Pexip Infinity: High

Affected versions of Pexip Infinity: 10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x, 17.x, 18.x, 19.x, 20.x

CVSS3 base score: 8.6 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N)

Mitigation: An attacker must be authenticated to the Pexip Infinity management web interface (or API) and have sufficient permissions to access the vulnerable functionality.

Restrict access to the "May modify system configuration", "May restore system backup", "May add/remove VMRs", and "May modify VMR configuration" permissions. Note, however, that these permissions apply to a wide range of configuration items and thus restricting access in this way may not be practical in all environments.

As general good practice, ensure that access to the Pexip Infinity Management Node is restricted to trusted networks using appropriate firewalls.

Resolution: Upgrade to Pexip Infinity 21.

CVE-201x February 2019 (multiple vulnerabilities)

Identified vulnerabilities

CVE-2019-7177: An input validation failure in the Pexip Infinity Administrator interface allows an authenticated remote attacker to execute arbitrary code as an unprivileged user on Pexip Infinity nodes.

Impact to Pexip Infinity: Critical

Affected versions of Pexip Infinity: 10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x, 17.x, 18.x, 19.x, 20

CVSS3 base score: 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

Mitigation: An attacker must be authenticated to the Pexip Infinity Administrator interface (or API) and have sufficient permissions to access the vulnerable functionality.

Restrict access to the "May modify system configuration", "May restore system backup", "May add/remove VMRs", and "May modify VMR configuration" permissions. Note, however, that these permissions apply to a wide range of configuration items and thus restricting access in this way may not be practical in all environments.

As general good practice, ensure that access to the Pexip Infinity Management Node is restricted to trusted networks using appropriate firewalls.

Resolution: Upgrade to Pexip Infinity 20.1.

Credit: This issue was discovered and reported by Nenad Stojanovski from the Google Security Team.

CVE-2019-7178: Insufficient validation of the contents of a system backup archive during system restore allows an authenticated remote attacker (or a local attacker with the ability to execute arbitrary code) to install and execute arbitrary code as the root user on the Pexip InfinityManagement Node.

Impact to Pexip Infinity: Critical

Affected versions of Pexip Infinity: 9.x, 10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x, 17.x, 18.x, 19.x, 20

CVSS3 base score: 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

Mitigation: A remote attacker must be authenticated to the Pexip Infinity Administrator interface (or API) and have sufficient permissions to access the vulnerable functionality.

If running Pexip Infinity 18.0 or later, restrict access to the "May restore system backup" permission. This permits minimization of the number of administrative users who may perform a system restore.

If running a version of Pexip Infinity earlier than 18, restrict access to both the "May view system configuration" and "May modify system configuration" permissions. This permits minimization of the number of administrative users who are able to access system restore. Note, however, that these permissions apply to a wide range of system-level configuration and thus restricting access in this way may not be practical in all environments.

Ensure system backup archives are handled with appropriate care and only ever restore backups which are trusted.

As general good practice, ensure that access to the Pexip Infinity Management Node is restricted to trusted networks using appropriate firewalls.

Resolution: Upgrade to Pexip Infinity 20.1.

Credit: This issue was discovered and reported by Nenad Stojanovski from the Google Security Team.