SB2021041642 - Multiple vulnerabilities in envoy

Description

This security bulletin contains information about 3 vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2021-28682)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to integer overflow in grpc-timeout handling when processing large grpc-timeout values. A remote attacker can send a specially crafted request with a large grpc-timeout value to cause a denial of service.

2) Uncaught Exception (CVE-ID: CVE-2021-28683)

CWE-ID: CWE-248 - Uncaught Exception

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of unknown TLS alert codes in the TLS alert processing logic when processing a peer-supplied TLS alert. A remote attacker can send a TLS alert with an unknown code to cause a denial of service.

3) Reachable assertion (CVE-ID: CVE-2021-29258)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a reachable assertion in HTTP/2 METADATA handling when processing an empty METADATA map. A remote attacker can send a specially crafted HTTP/2 request to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjgg
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfg
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-rqvq-hxw5-776j