CVE-2024-25617
Denial of Service in HTTP Header parser in squid proxy
In short
Squid proxy can crash when processing very large HTTP headers sent by remote clients or servers. This causes the proxy to stop working temporarily, disrupting web access for all users relying on it.
Technical detail
A Collapse of Data into Unsafe Value flaw in Squid's HTTP header parser allows remote attackers to trigger a Denial of Service by sending oversized headers exceeding request_header_max_size or reply_header_max_size limits. Affected versions prior to 6.5 use unsafe default values; exploitation requires no authentication and impacts proxy availability.
Summary generated and translated by AI from the official description.
Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
squid-cache · squidWant to know if your infrastructure is exposed to this?
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