CVE-2023-42669

NameCVE-2023-42669
DescriptionA vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as "rpcecho" runs in the main RPC task.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-5525-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
samba (PTS)buster2:4.9.5+dfsg-5+deb10u3vulnerable
buster (security)2:4.9.5+dfsg-5+deb10u5vulnerable
bullseye2:4.13.13+dfsg-1~deb11u5vulnerable
bullseye (security)2:4.13.13+dfsg-1~deb11u6vulnerable
bookworm, bookworm (security)2:4.17.12+dfsg-0+deb12u1fixed
trixie2:4.20.1+dfsg-1fixed
sid2:4.20.1+dfsg-4fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
sambasourcebookworm2:4.17.12+dfsg-0+deb12u1DSA-5525-1
sambasource(unstable)2:4.19.1+dfsg-1

Notes

[bullseye] - samba <ignored> (Domain controller functionality is EOLed, see DSA DSA-5477-1)
[buster] - samba <ignored> (Domain controller functionality is EOLed, see DSA-5015-1)
https://www.samba.org/samba/security/CVE-2023-42669.html

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