OESA-2022-1851

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OESA-2022-1851

Summary: squid security update

Details: Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests. Security Fix(es): 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.(CVE-2019-12521)

References: https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1851, https://nvd.nist.gov/vuln/detail/CVE-2019-12521