Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.

The remote host is affected by the vulnerability described in GLSA-202105-15 (Prosody IM: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Prosody IM. Please       review the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

Multiple security issues were found in Prosody, a lightweight Jabber/XMPP server, which could result in denial of service or information disclosure.

This update for prosody fixes the following issues :

prosody was updated to 0.11.9 :

Security :

  - mod_limits, prosody.cfg.lua: Enable rate limits by     default

  - certmanager: Disable renegotiation by default

  - mod_proxy65: Restrict access to local c2s connections by     default

  - util.startup: Set more aggressive defaults for GC

  - mod_c2s, mod_s2s, mod_component, mod_bosh,     mod_websockets: Set default stanza size limits

  - mod_authinternal(plain,hashed): Use constant-time string     comparison for secrets

  - mod_dialback: Remove dialback-without-dialback feature

  - mod_dialback: Use constant-time comparison with hmac

Minor changes :

  - util.hashes: Add constant-time string comparison     (binding to CRYPTO_memcmp)

  - mod_c2s: Don&rsquo;t throw errors in async code when     connections are gone

  - mod_c2s: Fix traceback in session close when conn is nil

  - core.certmanager: Improve detection of LuaSec/OpenSSL     capabilities

  - mod_saslauth: Use a defined SASL error

  - MUC: Add support for advertising     muc#roomconfig_allowinvites in room disco#info

  - mod_saslauth: Don&rsquo;t throw errors in async code     when connections are gone

  - mod_pep: Advertise base pubsub feature (fixes #1632:
    mod_pep missing pubsub feature in disco)

  - prosodyctl check config: Add &lsquo;gc&rsquo; to list of     global options

  - prosodyctl about: Report libexpat version if known

  - util.xmppstream: Add API to dynamically configure the     stanza size limit for a stream

  - util.set: Add is_set() to test if an object is a set

  - mod_http: Skip IP resolution in non-proxied case

  - mod_c2s: Log about missing conn on async state changes

  - util.xmppstream: Reduce internal default xmppstream     limit to 1MB

Relevant: https://prosody.im/security/advisory_20210512

  - boo#1186027: Prosody XMPP server advisory 2021-05-12

  - CVE-2021-32919

  - CVE-2021-32917

  - CVE-2021-32917

  - CVE-2021-32920

  - CVE-2021-32918

Update to 0.11.8 :

Security :

  - mod_saslauth: Disable &lsquo;tls-unique&rsquo; channel     binding with TLS 1.3 (#1542)

Fixes and improvements :

  - net.websocket.frames: Improve websocket masking     performance by using the new util.strbitop

  - util.strbitop: Library for efficient bitwise operations     on strings

Minor changes :

  - MUC: Correctly advertise whether the subject can be     changed (#1155)

  - MUC: Preserve disco &lsquo;node&rsquo; attribute (or     lack thereof) in responses (#1595)

  - MUC: Fix logic bug causing unnecessary presence to be     sent (#1615)

  - mod_bosh: Fix error if client tries to connect to     component (#425)

  - mod_bosh: Pick out the &lsquo;wait&rsquo; before     checking it instead of earlier

  - mod_pep: Advertise base PubSub feature (#1632)

  - mod_pubsub: Fix notification stanza type setting (#1605)

  - mod_s2s: Prevent keepalives before client has     established a stream

  - net.adns: Fix bug that sent empty DNS packets (#1619)

  - net.http.server: Don&rsquo;t send Content-Length on     1xx/204 responses (#1596)

  - net.websocket.frames: Fix length calculation bug (#1598)

  - util.dbuffer: Make length API in line with Lua strings

  - util.dbuffer: Optimize substring operations

  - util.debug: Fix locals being reported under wrong stack     frame in some cases

  - util.dependencies: Fix check for Lua bitwise operations     library (#1594)

  - util.interpolation: Fix combination of filters and     fallback values #1623

  - util.promise: Preserve tracebacks

  - util.stanza: Reject ASCII control characters (#1606)

  - timers: Ensure timers can&rsquo;t block other processing     (#1620)

Update to 0.11.7 :

Security :

  - mod_websocket: Enforce size limits on received frames     (fixes #1593)

Fixes and improvements :

  - mod_c2s, mod_s2s: Make stanza size limits configurable

  - Add configuration options to control Lua garbage     collection parameters

  - net.http: Backport SNI support for outgoing HTTP     requests (#409)

  - mod_websocket: Process all data in the buffer on close     frame and connection errors (fixes #1474, #1234)

  - util.indexedbheap: Fix heap data structure corruption,     causing some timers to fail after a reschedule (fixes     #1572)

Update to 0.11.6 :

Fixes and improvements :

  - mod_storage_internal: Fix error in time limited queries     on items without &lsquo;when&rsquo; field, fixes #1557

  - mod_carbons: Fix handling of incoming MUC PMs #1540

  - mod_csi_simple: Consider XEP-0353: Jingle Message     Initiation important

  - mod_http_files: Avoid using inode in etag, fixes #1498:
    Fail to download file on FreeBSD

  - mod_admin_telnet: Create a DNS resolver per console     session (fixes #1492: Telnet console DNS commands     reduced usefulness)

  - core.certmanager: Move EECDH ciphers before EDH in     default cipherstring (fixes #1513)

  - mod_s2s: Escape invalid XML in loggin (same way as     mod_c2s) (fixes #1574: Invalid XML input on s2s     connection is logged unescaped)

  - mod_muc: Allow control over the     server-admins-are-room-owners feature (see #1174)

  - mod_muc_mam: Remove spoofed archive IDs before archiving     (fixes #1552: MUC MAM may strip its own archive id)

  - mod_muc_mam: Fix stanza id filter event name, fixes     #1546: mod_muc_mam does not strip spoofed stanza ids

  - mod_muc_mam: Fix missing advertising of XEP-0359, fixes     #1547: mod_muc_mam does not advertise stanza-id

Minor changes :

  - net.http API: Add request:cancel() method

  - net.http API: Fix traceback on invalid URL passed to     request()

  - MUC: Persist affiliation_data in new MUC format

  - mod_websocket: Fire event on session creation (thanks     Aaron van Meerten)

  - MUC: Always include     &lsquo;affiliation&rsquo;/&lsquo;role&rsquo; attributes,     defaulting to &lsquo;none&rsquo; if nil

  - mod_tls: Log when certificates are (re)loaded

  - mod_vcard4: Report correct error condition (fixes #1521:
    mod_vcard4 reports wrong error)

  - net.http: Re-expose destroy_request() function (fixes     unintentional API breakage)

  - net.http.server: Strip port from Host header in IPv6     friendly way (fix #1302)

  - util.prosodyctl: Tell prosody do daemonize via command     line flag (fixes #1514)

  - SASL: Apply saslprep where necessary, fixes #1560: Login     fails if password contains special chars

  - net.http.server: Fix reporting of missing Host header

  - util.datamanager API: Fix iterating over     &ldquo;users&rdquo; (thanks marc0s)

  - net.resolvers.basic: Default conn_type to     &lsquo;tcp&rsquo; consistently if unspecified (thanks     marc0s)

  - mod_storage_sql: Fix check for deletion limits (fixes     #1494)

  - mod_admin_telnet: Handle unavailable cipher info (fixes     #1510: mod_admin_telnet backtrace)

  - Log warning when using prosodyctl start/stop/restart

  - core.certmanager: Look for privkey.pem to go with     fullchain.pem (fixes #1526)

  - mod_storage_sql: Add index covering sort_id to improve     performance (fixes #1505)

  - mod_mam,mod_muc_mam: Allow other work to be performed     during archive cleanup (fixes #1504)

  - mod_muc_mam: Don&rsquo;t strip MUC tags, fix #1567: MUC     tags stripped by mod_muc_mam

  - mod_pubsub, mod_pep: Ensure correct number of children     of (fixes #1496)

  - mod_register_ibr: Add FORM_TYPE as required by XEP-0077     (fixes #1511)

  - mod_muc_mam: Fix traceback saving message from     non-occupant (fixes #1497)

  - util.startup: Remove duplicated initialization of     logging (fix #1527: startup: Logging initialized twice)

The Prosody security advisory 2021-05-12 reports :

This advisory details 5 new security vulnerabilities discovered in the Prosody.im XMPP server software. All issues are fixed in the 0.11.9 release default configuration.

- CVE-2021-32918: DoS via insufficient memory consumption controls

- CVE-2021-32920: DoS via repeated TLS renegotiation causing excessive CPU consumption

- CVE-2021-32921: Use of timing-dependent string comparison with sensitive values

- CVE-2021-32917: Use of mod_proxy65 is unrestricted in default configuration

- CVE-2021-32919: Undocumented dialback-without-dialback option insecure

ID	Name	Product	Family	Severity
157035	GLSA-202105-15 : Prosody IM: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
149609	Debian DSA-4916-1 : prosody - security update	Nessus	Debian Local Security Checks	high
149566	openSUSE Security Update : prosody (openSUSE-2021-728)	Nessus	SuSE Local Security Checks	high
149493	FreeBSD : Prosody -- multiple vulnerabilities (fc75570a-b417-11eb-a23d-c7ab331fd711)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2021-32920

high

Tenable Plugins

high

high

high

high