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    CVE-2020-28327

    A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1. and Certified Asterisk before 16.8-cert5. Upon receiving a new SIP Invite, Asterisk did not return the created dialog locked or referenced. This caused a gap between the creation of the dialog object, and its next use by the thread that created it. Depending on some off-nominal circumstances and timing, it was possible for another thread to free said dialog in this gap. Asterisk could then crash when the dialog object, or any of its dependent objects, were dereferenced or accessed next by the initial-creation thread. Note, however, that this crash can only occur when using a connection-oriented protocol (e.g., TCP or TLS, but not UDP) for SIP transport. Also, the remote client must be authenticated, or Asterisk must be configured for anonymous calling.

    Published:Nov 6, 2020
    Last Modified:Nov 21, 2024
    EPS:Nov 6, 2020
    EPSS Score:0.02764
    CVSS Score:5.3

    Affected Products

    Vendor
    Digium
    Product
    Certified Asterisk
    Vendor
    Sangoma
    Product
    Asterisk

    Exploits

    https://issues.asterisk.org/jira/browse/ASTERISK-29057https://issues.asterisk.org/jira/browse/ASTERISK-29057

    Related CVEs

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    CVE-2021-26713 (CVSS 6.5) — A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, an…
    CVE-2021-26712 (CVSS 7.5) — Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified…
    CVE-2021-26906 (CVSS 5.9) — An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x throug…
    CVE-2021-26717 (CVSS 7.5) — An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 an…
    CVE-2019-18610 (CVSS 8.8) — An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and Certified Asterisk 13.21…
    CVE-2019-18976 (CVSS 7.5) — An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.…
    CVE-2019-18790 (CVSS 6.5) — An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, an…
    CVE-2019-13161 (CVSS 5.3) — An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x throug…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High