CVE-2021-37706

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.

References

Affected packages

Git / github.com/asterisk/asterisk

Affected ranges

Type: GIT
Repo: https://github.com/asterisk/asterisk
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

d436f568583184a13aa46349af5a3f0907087b44

Affected versions

16.*

16.8.0-rc1

16.8.0-rc2

Git / github.com/pjsip/pjproject

Affected ranges

Type: GIT
Repo: https://github.com/pjsip/pjproject
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

15663e3f37091069b8c98a7fce680dc04bc8e865

Affected versions

2.*

2.10

2.11

Database specific

vanir_signatures

[
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "286375471227338908900759340395951320869",
                "337170165584158815641361604078421931103",
                "218425442522531084557250897674746904437",
                "215575948014480304126719586812745130850"
            ]
        },
        "source": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865",
        "id": "CVE-2021-37706-6c9a95f2",
        "signature_version": "v1",
        "target": {
            "file": "pjnath/src/pjnath/stun_msg.c"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "function_hash": "166111760674862860056573304105766004106",
            "length": 452.0
        },
        "source": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865",
        "id": "CVE-2021-37706-9e426c0f",
        "signature_version": "v1",
        "target": {
            "function": "decode_errcode_attr",
            "file": "pjnath/src/pjnath/stun_msg.c"
        }
    }
]