GCVE-1988-2026-0108

The Asterisk Development Team would like to announce security release  
Asterisk 20.20.1.

The release artifacts are available for immediate download at  
https://github.com/asterisk/asterisk/releases/tag/20.20.1
and
https://downloads.asterisk.org/pub/telephony/asterisk

Repository: https://github.com/asterisk/asterisk
Tag: 20.20.1

## Change Log for Release asterisk-20.20.1

### Links:

 - [Full ChangeLog](https://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-20.20.1.html)  
 - [GitHub Diff](https://github.com/asterisk/asterisk/compare/20.20.0...20.20.1)  
 - [Tarball](https://downloads.asterisk.org/pub/telephony/asterisk/asterisk-20.20.1.tar.gz)  
 - [Downloads](https://downloads.asterisk.org/pub/telephony/asterisk)  

### Summary:

- Commits: 18
- Commit Authors: 6
- Issues Resolved: 0
- Security Advisories Resolved: 19
  - [GHSA-3g56-cgrh-95p5](https://github.com/asterisk/asterisk/security/advisories/GHSA-3g56-cgrh-95p5): chan_unistim 
DIALPAGE digit handling can overflow phone_number and crash Asterisk
  - [GHSA-3rhj-hhw7-m6fw](https://github.com/asterisk/asterisk/security/advisories/GHSA-3rhj-hhw7-m6fw): NULL Pointer 
Dereference in HTTP AMI Digest Authentication
  - [GHSA-4pgv-j3mr-3rcp](https://github.com/asterisk/asterisk/security/advisories/GHSA-4pgv-j3mr-3rcp): Reflected XSS 
in Phone Provisioning HTTP Error Pages
  - [GHSA-589g-qgf8-m6mx](https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mx): Stack buffer 
overflow in MWI NOTIFY Message-Account parsing
  - [GHSA-746q-794h-cc7f](https://github.com/asterisk/asterisk/security/advisories/GHSA-746q-794h-cc7f): Out-of-Bounds 
Read in Q.931 Information Element Parser (H.323 Addon)
  - [GHSA-8jhw-m2hg-vp3h](https://github.com/asterisk/asterisk/security/advisories/GHSA-8jhw-m2hg-vp3h): Heap Buffer 
Overflow in OGG/Speex File Playback (format_ogg_speex)
  - [GHSA-8jw3-ccr9-xrmf](https://github.com/asterisk/asterisk/security/advisories/GHSA-8jw3-ccr9-xrmf): Buffer 
over-read in Asterisk PJSIP MWI body parser
  - [GHSA-g8q2-p36q-94f6](https://github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6): 
Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP connection closes during SDP processing
  - [GHSA-j2mm-57pq-jh94](https://github.com/asterisk/asterisk/security/advisories/GHSA-j2mm-57pq-jh94): Possible RED 
T.140 Generation Accumulation OOB Write
  - [GHSA-mxgm-8c6f-5p8f](https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f): Stack buffer 
overflow in res_xmpp XMPP namespace prefix handling
  - [GHSA-ph27-3m5q-mj5m](https://github.com/asterisk/asterisk/security/advisories/GHSA-ph27-3m5q-mj5m): SQL Injection 
in cel_pgsql and cel_tds via CELGenUserEvent eventtype Field
  - [GHSA-q9fr-m7g8-6ph5](https://github.com/asterisk/asterisk/security/advisories/GHSA-q9fr-m7g8-6ph5): Asterisk 
app_sms.c copies externally controlled SMS lengths into fixed in-struct buffers
  - [GHSA-qf8j-jp7h-c5hx](https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx): Out-of-Bounds 
Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
  - [GHSA-r6c2-hwc2-j4mp](https://github.com/asterisk/asterisk/security/advisories/GHSA-r6c2-hwc2-j4mp): LDAP Filter 
Injection in res_config_ldap via SIP Username (Unauthenticated Information Disclosure)
  - [GHSA-vfhr-r9x9-c687](https://github.com/asterisk/asterisk/security/advisories/GHSA-vfhr-r9x9-c687): Possible RED 
T.140 Heap Buffer Overflow
  - [GHSA-vrfp-mg3q-3959](https://github.com/asterisk/asterisk/security/advisories/GHSA-vrfp-mg3q-3959): ARI 
setChannelVar bypasses live_dangerously and permits FILE() writes
  - [GHSA-wcvv-g26m-wx5c](https://github.com/asterisk/asterisk/security/advisories/GHSA-wcvv-g26m-wx5c): ARI 
REST-over-WebSocket read-only bypass allows arbitrary module path load and conditional RCE
  - [GHSA-x348-j6c9-77f3](https://github.com/asterisk/asterisk/security/advisories/GHSA-x348-j6c9-77f3): Stack Buffer 
Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-byte Buffer
  - [GHSA-xgj6-2gc5-5x9c](https://github.com/asterisk/asterisk/security/advisories/GHSA-xgj6-2gc5-5x9c): ast_loggrabber 
executes python script in world writable directory(`/tmp`) leading to potential privilege escalation And RCE

### User Notes:

### Upgrade Notes:

### Developer Notes:

- #### ARI: Make ARI applications respect live_dangerously.
  ARI applications can no longer call "dangerous" dialplan
  functions like DB(), FILE(), SHELL(), CURL(), STAT(), etc. without
  enabling "live_dangerously" in asterisk.conf.
  Resolves: #GHSA-vrfp-mg3q-3959

### Commit Authors:

- George Joseph: (6)
- Mike Bradeen: (2)
- Milan Kyselica: (7)
- Pengpeng Hou: (1)
- Roberto Paleari: (1)
- ThatTotallyRealMyth: (1)

## Issue and Commit Detail:

### Closed Issues:

  - !GHSA-3g56-cgrh-95p5: chan_unistim DIALPAGE digit handling can overflow phone_number and crash Asterisk
  - !GHSA-3rhj-hhw7-m6fw: NULL Pointer Dereference in HTTP AMI Digest Authentication
  - !GHSA-4pgv-j3mr-3rcp: Reflected XSS in Phone Provisioning HTTP Error Pages
  - !GHSA-589g-qgf8-m6mx: Stack buffer overflow in MWI NOTIFY Message-Account parsing
  - !GHSA-746q-794h-cc7f: Out-of-Bounds Read in Q.931 Information Element Parser (H.323 Addon)
  - !GHSA-8jhw-m2hg-vp3h: Heap Buffer Overflow in OGG/Speex File Playback (format_ogg_speex)
  - !GHSA-8jw3-ccr9-xrmf: Buffer over-read in Asterisk PJSIP MWI body parser
  - !GHSA-g8q2-p36q-94f6: Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP connection closes during SDP 
processing
  - !GHSA-j2mm-57pq-jh94: Possible RED T.140 Generation Accumulation OOB Write
  - !GHSA-mxgm-8c6f-5p8f: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
  - !GHSA-ph27-3m5q-mj5m: SQL Injection in cel_pgsql and cel_tds via CELGenUserEvent eventtype Field
  - !GHSA-q9fr-m7g8-6ph5: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct buffers
  - !GHSA-qf8j-jp7h-c5hx: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
  - !GHSA-r6c2-hwc2-j4mp: LDAP Filter Injection in res_config_ldap via SIP Username (Unauthenticated Information 
Disclosure)
  - !GHSA-vfhr-r9x9-c687: Possible RED T.140 Heap Buffer Overflow
  - !GHSA-vrfp-mg3q-3959: ARI setChannelVar bypasses live_dangerously and permits FILE() writes
  - !GHSA-wcvv-g26m-wx5c: ARI REST-over-WebSocket read-only bypass allows arbitrary module path load and conditional RCE
  - !GHSA-x348-j6c9-77f3: Stack Buffer Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-byte Buffer
  - !GHSA-xgj6-2gc5-5x9c: ast_loggrabber executes python script in world writable directory(`/tmp`) leading to 
potential privilege escalation And RCE

### Commits By Author:

- #### George Joseph (6):
  - chan_unistim.c: Prevent overrun of phone_number field.
  - res_ari: Ensure read-only users are properly authorized via REST Over WebSocket.
  - pjsip_message_filter: Use pj_strdup instead of pj_strassign to save local address.
  - ooh323c/ooq931.c: Ensure ooQ931Decode doesn't run out-of-bounds.
  - ARI: Make ARI applications respect live_dangerously.
  - res_rtp_asterisk.c: Address 2 potential T.140 RED buffer overruns.

- #### Mike Bradeen (2):
  - manager: Use remote address in user error logging
  - ooh323: Prevent potential buffer overflow in trace logging

- #### Milan Kyselica (7):
  - res_xmpp: Fix stack buffer overflow in namespace prefix handling
  - res_pjsip_pubsub: Add width limit to sscanf in MWI NOTIFY parser
  - res_config_ldap: Escape LDAP filter values per RFC 4515
  - cel_pgsql, cel_tds: Escape eventtype field to prevent SQL injection
  - http: Escape error page text to prevent reflected XSS
  - codec_codec2: Only process complete Codec2 frames in decoder
  - format_ogg_speex: Add bounds check to prevent heap buffer overflow

- #### Pengpeng Hou (1):
  - app_sms: Bound protocol 1 SMS unpacking to fixed-size buffers

- #### Roberto Paleari (1):
  - res/res_pjsip_pubsub.c: Fix buffer over-read in MWI body parser

- #### ThatTotallyRealMyth (1):
  - ast_loggrabber: Install the ast_tsconvert.py script to a secure temp directory.

### Commit List:

-  ast_loggrabber: Install the ast_tsconvert.py script to a secure temp directory.
-  chan_unistim.c: Prevent overrun of phone_number field.
-  res_ari: Ensure read-only users are properly authorized via REST Over WebSocket.
-  pjsip_message_filter: Use pj_strdup instead of pj_strassign to save local address.
-  ooh323c/ooq931.c: Ensure ooQ931Decode doesn't run out-of-bounds.
-  ARI: Make ARI applications respect live_dangerously.
-  res_rtp_asterisk.c: Address 2 potential T.140 RED buffer overruns.
-  res/res_pjsip_pubsub.c: Fix buffer over-read in MWI body parser
-  manager: Use remote address in user error logging
-  ooh323: Prevent potential buffer overflow in trace logging
-  app_sms: Bound protocol 1 SMS unpacking to fixed-size buffers
-  res_xmpp: Fix stack buffer overflow in namespace prefix handling
-  res_pjsip_pubsub: Add width limit to sscanf in MWI NOTIFY parser
-  res_config_ldap: Escape LDAP filter values per RFC 4515
-  cel_pgsql, cel_tds: Escape eventtype field to prevent SQL injection
-  http: Escape error page text to prevent reflected XSS
-  codec_codec2: Only process complete Codec2 frames in decoder
-  format_ogg_speex: Add bounds check to prevent heap buffer overflow

### Commit Details:

#### ast_loggrabber: Install the ast_tsconvert.py script to a secure temp directory.
  Author: ThatTotallyRealMyth
  Date:   2026-03-19

  The ast_tsconvert.py script called by ast_loggrabber is now installed in a
  temporary directory that isn't world readable or writable.

  Resolves: #GHSA-xgj6-2gc5-5x9c

#### chan_unistim.c: Prevent overrun of phone_number field.
  Author: George Joseph
  Date:   2026-06-15

  Add a check to key_dial_page() to ensure that dialed digits won't overrun
  the phone_number field.

  Resolves: #GHSA-3g56-cgrh-95p5

#### res_ari: Ensure read-only users are properly authorized via REST Over WebSocket.
  Author: George Joseph
  Date:   2026-06-12

  The REST over WebSocket path now properly prevents non-GET methods from
  being executed on inbound WebSockets.

  * The query parameters from the original incoming GET request that caused the
  upgrade to WebSocket are now passed to all REST requests that come from the
  client. This ensures that if the client authenticated with a read-only
  userid using the "api_key" query_string parameter, REST requests coming
  in over the WebSocket will only be able to execute GETs on resources.
  The HTTP headers were already passed to the REST requests so if the
  client had authenticated via an "Authorization" it was properly handled.

  * New tests have been added to test_ari.c to check that read-only users
  are properly denied access to resources using non-GET methods.  Several
  memory leaks were also squashed.

  Resolves: #GHSA-wcvv-g26m-wx5c

#### pjsip_message_filter: Use pj_strdup instead of pj_strassign to save local address.
  Author: George Joseph
  Date:   2026-06-10

  The filter_on_tx_message() function was using pj_strassign() to save the pointer
  of the pjproject transport local address to a local pj_str_t variable.  That
  variable was ultimately used to set the Contact header's uri->host and the SDP
  connection attribute's address again using pj_strassign.  pj_strassign() doesn't
  copy the actual value of the pj_str_t however, it just copies the pointer so
  if a connection-oriented transport is disconnected before the 200 OK with the
  SDP is sent, those pointers will be invalid which can cause use-after-free
  issues. To prevent this, filter_on_tx_message() now uses pj_strdup with the
  tdata->pool as the backing store to save the local IP address to the local
  variable.  pj_strassign() can then be used safely later on since the tdata
  will be available for the life of the transaction.

  Resolves: #GHSA-g8q2-p36q-94f6

#### ooh323c/ooq931.

GCVE-1988-2026-0108

Asterisk Security Release 20.20.1

Description (en)

References