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Debian DLA-3641-1 : jetty9 - LTS security update
medium Nessus Plugin ID 184061
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Synopsis
The remote Debian host is missing one or more security-related updates.Description
The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3641 advisory.- In Eclipse Jetty version 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2, if GZIP request body inflation is enabled and requests from different clients are multiplexed onto a single connection, and if an attacker can send a request with a body that is received entirely but not consumed by the application, then a subsequent request on the same connection will see that body prepended to its body. The attacker will not see any data but may inject data into the body of the subsequent request. (CVE-2020-27218)
- Eclipse Jetty provides a web server and servlet container. In versions 11.0.0 through 11.0.15, 10.0.0 through 10.0.15, and 9.0.0 through 9.4.52, an integer overflow in `MetaDataBuilder.checkSize` allows for HTTP/2 HPACK header values to exceed their size limit. `MetaDataBuilder.java` determines if a header name or value exceeds the size limit, and throws an exception if the limit is exceeded. However, when length is very large and huffman is true, the multiplication by 4 in line 295 will overflow, and length will become negative. `(_size+length)` will now be negative, and the check on line 296 will not be triggered.
Furthermore, `MetaDataBuilder.checkSize` allows for user-entered HPACK header value sizes to be negative, potentially leading to a very large buffer allocation later on when the user-entered size is multiplied by 2. This means that if a user provides a negative length value (or, more precisely, a length value which, when multiplied by the 4/3 fudge factor, is negative), and this length value is a very large positive number when multiplied by 2, then the user can cause a very large buffer to be allocated on the server.
Users of HTTP/2 can be impacted by a remote denial of service attack. The issue has been fixed in versions 11.0.16, 10.0.16, and 9.4.53. There are no known workarounds. (CVE-2023-36478)
- 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-2023-44487)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade the jetty9 packages.For Debian 10 buster, these problems have been fixed in version 9.4.50-4+deb10u1.
See Also
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=976211
https://security-tracker.debian.org/tracker/source-package/jetty9
https://www.debian.org/lts/security/2023/dla-3641
https://security-tracker.debian.org/tracker/CVE-2020-27218
https://security-tracker.debian.org/tracker/CVE-2023-36478
Plugin Details
Severity: Medium
ID: 184061
File Name: debian_DLA-3641.nasl
Version: 1.2
Type: local
Agent: unix
Family: Debian Local Security Checks
Published: 10/31/2023
Updated: 2/9/2024
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.1
CVSS v2
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 4.8
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P
CVSS Score Source: CVE-2020-27218
CVSS v3
Risk Factor: Medium
Base Score: 4.8
Temporal Score: 4.5
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:debian:debian_linux:jetty9, p-cpe:/a:debian:debian_linux:libjetty9-extra-java, p-cpe:/a:debian:debian_linux:libjetty9-java, cpe:/o:debian:debian_linux:10.0
Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/30/2023
Vulnerability Publication Date: 11/28/2020
CISA Known Exploited Vulnerability Due Dates: 10/31/2023