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h2o

optimized HTTP/1.x, HTTP/2 server

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general

source: h2o (main)
version: 2.2.5+dfsg2-7
maintainer: Apollon Oikonomopoulos (DMD) (LowNMU)
uploaders: Anton Gladky [DMD]
arch: all any
std-ver: 4.5.0
VCS: Git (Browse)

versions [more versions can be listed by madison] [old versions available from snapshot.debian.org]

[pool directory]

oldstable: 2.2.5+dfsg2-6
stable: 2.2.5+dfsg2-7

versioned links

2.2.5+dfsg2-6: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
2.2.5+dfsg2-7: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]

binaries

h2o
h2o-doc
libh2o-dev
libh2o-dev-common
libh2o-evloop-dev
libh2o-evloop0.13
libh2o0.13

package is gone

This package is not in any development repository. This probably means that the package has been removed (or has been renamed). Thus the information here is of little interest ... the package is going to disappear unless someone takes it over and reintroduces it.

action needed

3 security issues in sid high

There are 3 open security issues in sid.

3 important issues:

CVE-2023-41337: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent. The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening. Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server. An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities. A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
CVE-2024-25622: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
CVE-2024-45397: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.

Created: 2023-12-24 Last update: 2025-05-02 22:55

3 security issues in trixie high

There are 3 open security issues in trixie.

3 important issues:

CVE-2023-41337: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent. The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening. Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server. An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities. A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
CVE-2024-25622: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
CVE-2024-45397: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.

Created: 2023-12-24 Last update: 2025-02-27 05:02

1 security issue in buster high

There is 1 open security issue in buster.

1 important issue:

CVE-2023-41337: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent. The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening. Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server. An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities. A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.

Created: 2023-12-24 Last update: 2024-05-03 05:39

4 low-priority security issues in bookworm low

There are 4 open security issues in bookworm.

4 issues left for the package maintainer to handle:

CVE-2023-41337: (needs triaging) h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent. The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening. Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server. An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities. A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
CVE-2023-44487: (needs triaging) The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
CVE-2024-25622: (needs triaging) h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
CVE-2024-45397: (needs triaging) h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.

You can find information about how to handle these issues in the security team's documentation.

Created: 2023-06-10 Last update: 2025-05-26 05:30

Build log checks report 1 warning low

Build log checks report 1 warning

Created: 2018-06-03 Last update: 2018-09-23 06:00

news

[2025-05-26] Removed 2.2.5+dfsg2-11 from unstable (Debian FTP Masters)
[2025-05-03] h2o REMOVED from testing (Debian testing watch)
[2025-01-01] h2o 2.2.5+dfsg2-11 MIGRATED to testing (Debian testing watch)
[2024-12-30] Accepted h2o 2.2.5+dfsg2-11 (source) into unstable (Gianfranco Costamagna)
[2024-12-30] Accepted h2o 2.2.5+dfsg2-10 (source) into unstable (Gianfranco Costamagna)
[2024-10-20] h2o 2.2.5+dfsg2-9 MIGRATED to testing (Debian testing watch)
[2024-10-18] Accepted h2o 2.2.5+dfsg2-9 (source) into unstable (Anton Gladky)
[2024-08-10] h2o REMOVED from testing (Debian testing watch)
[2024-05-03] h2o 2.2.5+dfsg2-8.1 MIGRATED to testing (Debian testing watch)
[2024-02-28] Accepted h2o 2.2.5+dfsg2-8.1 (source) into unstable (Lukas Märdian)
[2024-02-01] Accepted h2o 2.2.5+dfsg2-8.1~exp1 (source) into experimental (Graham Inggs)
[2023-10-29] Accepted h2o 2.2.5+dfsg2-2+deb10u2 (source) into oldoldstable (Anton Gladky)
[2023-10-22] h2o 2.2.5+dfsg2-8 MIGRATED to testing (Debian testing watch)
[2023-10-22] h2o 2.2.5+dfsg2-8 MIGRATED to testing (Debian testing watch)
[2023-10-20] Accepted h2o 2.2.5+dfsg2-8 (source) into unstable (Anton Gladky)
[2023-04-11] h2o 2.2.5+dfsg2-7 MIGRATED to testing (Debian testing watch)
[2023-03-21] Accepted h2o 2.2.5+dfsg2-7 (source) into unstable (Chris Hofstaedtler) (signed by: Christian Hofstaedtler)
[2022-04-21] h2o 2.2.5+dfsg2-6.2 MIGRATED to testing (Debian testing watch)
[2022-04-19] Accepted h2o 2.2.5+dfsg2-6.2 (source) into unstable (Chris Hofstaedtler) (signed by: Christian Hofstaedtler)
[2021-10-19] h2o 2.2.5+dfsg2-6.1 MIGRATED to testing (Debian testing watch)
[2021-10-17] Accepted h2o 2.2.5+dfsg2-6.1 (source) into unstable (Chris Hofstaedtler) (signed by: Christian Hofstaedtler)
[2020-12-21] h2o 2.2.5+dfsg2-6 MIGRATED to testing (Debian testing watch)
[2020-12-16] Accepted h2o 2.2.5+dfsg2-6 (source) into unstable (Anton Gladky)
[2020-05-04] h2o 2.2.5+dfsg2-5 MIGRATED to testing (Debian testing watch)
[2020-05-02] Accepted h2o 2.2.5+dfsg2-5 (source) into unstable (Anton Gladky)
[2020-05-01] Accepted h2o 2.2.5+dfsg2-5~exp1 (source) into experimental (Anton Gladky)
[2020-04-28] Accepted h2o 2.2.5+dfsg2-4 (source) into unstable (Anton Gladky)
[2019-08-31] Accepted h2o 2.2.5+dfsg2-2+deb10u1 (source amd64 all) into proposed-updates->stable-new, proposed-updates (Anton Gladky)
[2019-08-25] Accepted h2o 2.2.5+dfsg2-3~bpo9+1 (source) into stretch-backports->backports-policy, stretch-backports (Anton Gladky)
[2019-08-24] Accepted h2o 2.2.5+dfsg2-2+deb10u1 (source amd64 all) into stable->embargoed, stable (Anton Gladky)

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bugs [bug history graph]

all: 0

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