SB2019081456 - Resource management error in apache2 (Alpine package)
Published: August 14, 2019
Security Bulletin ID
SB2019081456
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource management error (CVE-ID: CVE-2019-9517)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect implementation of HTTP/2 protocol. A remote attacker can open the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=97cc1daad59156e767936e4ea1762d331195f7eb
- https://git.alpinelinux.org/aports/commit/?id=f9dbe36405c236b51c640ef3a59f0f14baeee18d
- https://git.alpinelinux.org/aports/commit/?id=578c97338a5cc6615df123d2759ef349dbf88c2c
- https://git.alpinelinux.org/aports/commit/?id=75cc679dead3d9b8aebb82a11c1f81a4eaaab853
- https://git.alpinelinux.org/aports/commit/?id=7149c919df587e3f9125fdac8bc2ccd4952027e3
- https://git.alpinelinux.org/aports/commit/?id=2352aedda7b946046e3bb408f94d6053f6468d74
- https://git.alpinelinux.org/aports/commit/?id=20dd33ed391e86126662bbb87b9b3d904e12d0b1
- https://git.alpinelinux.org/aports/commit/?id=720693cedfbcd03efff48adf05e47e4f4d1528f0
- https://git.alpinelinux.org/aports/commit/?id=c362e6f4f23eab577c0f6f522ec442a889ba2713
- https://git.alpinelinux.org/aports/commit/?id=f69ef91711a9edd270c57081b8cd8230ad8fed24