Note:
This project will be discontinued after December 13, 2021. [more]
2020-04-15
An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
Products | Ubuntu_linux, Debian_linux, Leap, Squid |
Type | Out-of-bounds Write (CWE-787) |
First patch | - None (likely due to unavailable code) |
Links |
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
• http://www.openwall.com/lists/oss-security/2020/04/23/1 • https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt • http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html • https://security.netapp.com/advisory/ntap-20210205-0006/ |