Security update for rubygem-rack SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:4273-1 Final 1 1 2025-11-27T08:12:25Z current 2025-11-27T08:12:25Z 2025-11-27T08:12:25Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for rubygem-rack This update for rubygem-rack fixes the following issues: - Update to version 2.2.20 (bsc#1251936) - CVE-2025-61919: Fixed application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap (bsc#1251936) - CVE-2025-61780: Fixed improper handling of headers in `Rack::Sendfile` allows for bypass of proxy-level access restrictions (bsc#1253951) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2025-4273,SUSE-SLE-Product-HA-15-SP3-2025-4273,SUSE-SLE-Product-HA-15-SP4-2025-4273,SUSE-SLE-Product-HA-15-SP5-2025-4273,SUSE-SLE-Product-HA-15-SP6-2025-4273,SUSE-SLE-Product-HA-15-SP7-2025-4273,openSUSE-SLE-15.6-2025-4273 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-20254273-1/ Link for SUSE-SU-2025:4273-1 https://lists.suse.com/pipermail/sle-security-updates/2025-November/023401.html E-Mail link for SUSE-SU-2025:4273-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1251936 SUSE Bug 1251936 https://bugzilla.suse.com/1253951 SUSE Bug 1253951 https://www.suse.com/security/cve/CVE-2025-61780/ SUSE CVE CVE-2025-61780 page https://www.suse.com/security/cve/CVE-2025-61919/ SUSE CVE CVE-2025-61919 page SUSE Linux Enterprise High Availability Extension 15 SP3 SUSE Linux Enterprise High Availability Extension 15 SP4 SUSE Linux Enterprise High Availability Extension 15 SP5 SUSE Linux Enterprise High Availability Extension 15 SP6 SUSE Linux Enterprise High Availability Extension 15 SP7 openSUSE Leap 15.6 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 ruby2.5-rubygem-rack-doc-2.2.20-150000.3.34.1 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of SUSE Linux Enterprise High Availability Extension 15 SP3 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of SUSE Linux Enterprise High Availability Extension 15 SP4 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of SUSE Linux Enterprise High Availability Extension 15 SP5 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of SUSE Linux Enterprise High Availability Extension 15 SP6 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-doc-2.2.20-150000.3.34.1 as a component of openSUSE Leap 15.6 Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in `Rack::Sendfile` when running behind a proxy that supports `x-sendfile` headers (such as Nginx). Specially crafted headers could cause `Rack::Sendfile` to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When `Rack::Sendfile` received untrusted `x-sendfile-type` or `x-accel-mapping` headers from a client, it would interpret them as proxy configuration directives. This could cause the middleware to send a "redirect" response to the proxy, prompting it to reissue a new internal request that was not subject to the proxy's access controls. An attacker could exploit this by setting a crafted `x-sendfile-type: x-accel-redirect` header, setting a crafted `x-accel-mapping` header, and requesting a path that qualifies for proxy-based acceleration. Attackers could bypass proxy-enforced restrictions and access internal endpoints intended to be protected (such as administrative pages). The vulnerability did not allow arbitrary file reads but could expose sensitive application routes. This issue only affected systems meeting all of the following conditions: The application used `Rack::Sendfile` with a proxy that supports `x-accel-redirect` (e.g., Nginx); the proxy did **not** always set or remove the `x-sendfile-type` and `x-accel-mapping` headers; and the application exposed an endpoint that returned a body responding to `.to_path`. Users should upgrade to Rack versions 2.2.20, 3.1.18, or 3.2.3, which require explicit configuration to enable `x-accel-redirect`. Alternatively, configure the proxy to always set or strip the header, or in Rails applications, disable sendfile completely. CVE-2025-61780 SUSE Linux Enterprise High Availability Extension 15 SP3:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP4:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP5:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP6:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP7:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 openSUSE Leap 15.6:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 openSUSE Leap 15.6:ruby2.5-rubygem-rack-doc-2.2.20-150000.3.34.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-20254273-1/ https://www.suse.com/security/cve/CVE-2025-61780.html CVE-2025-61780 https://bugzilla.suse.com/1251896 SUSE Bug 1251896 Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`). CVE-2025-61919 SUSE Linux Enterprise High Availability Extension 15 SP3:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP4:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP5:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP6:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 SUSE Linux Enterprise High Availability Extension 15 SP7:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 openSUSE Leap 15.6:ruby2.5-rubygem-rack-2.2.20-150000.3.34.1 openSUSE Leap 15.6:ruby2.5-rubygem-rack-doc-2.2.20-150000.3.34.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-20254273-1/ https://www.suse.com/security/cve/CVE-2025-61919.html CVE-2025-61919 https://bugzilla.suse.com/1251934 SUSE Bug 1251934