CVE-2021-41158
FreeSWITCH SIP Digest Leak Vulnerability
Description
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.7, an attacker can perform a SIP digest leak attack against FreeSWITCH and receive the challenge response of a gateway configured on the FreeSWITCH server. This is done by challenging FreeSWITCH's SIP requests with the realm set to that of the gateway, thus forcing FreeSWITCH to respond with the challenge response which is based on the password of that targeted gateway. Abuse of this vulnerability allows attackers to potentially recover gateway passwords by performing a fast offline password cracking attack on the challenge response. The attacker does not require special network privileges, such as the ability to sniff the FreeSWITCH's network traffic, to exploit this issue. Instead, what is required for this attack to work is the ability to cause the victim server to send SIP request messages to the malicious party. Additionally, to exploit this issue, the attacker needs to specify the correct realm which might in some cases be considered secret. However, because many gateways are actually public, this information can easily be retrieved. The vulnerability appears to be due to the code which handles challenges in `sofia_reg.c`, `sofia_reg_handle_sip_r_challenge()` which does not check if the challenge is originating from the actual gateway. The lack of these checks allows arbitrary UACs (and gateways) to challenge any request sent by FreeSWITCH with the realm of the gateway being targeted. This issue is patched in version 10.10.7. Maintainers recommend that one should create an association between a SIP session for each gateway and its realm to make a check be put into place for this association when responding to challenges.
INFO
Published Date :
Oct. 26, 2021, 2:15 p.m.
Last Modified :
Oct. 24, 2022, 4:06 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41158.
| URL | Resource |
|---|---|
| http://seclists.org/fulldisclosure/2021/Oct/40 | Mailing List Patch Third Party Advisory |
| https://github.com/signalwire/freeswitch/releases/tag/v1.10.7 | Release Notes Third Party Advisory |
| https://github.com/signalwire/freeswitch/security/advisories/GHSA-3v3f-99mv-qvj4 | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-41158 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41158 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Oct. 24, 2022
Action Type Old Value New Value Added CWE NIST CWE-346 -
Initial Analysis by [email protected]
Oct. 28, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type http://seclists.org/fulldisclosure/2021/Oct/40 No Types Assigned http://seclists.org/fulldisclosure/2021/Oct/40 Mailing List, Patch, Third Party Advisory Changed Reference Type https://github.com/signalwire/freeswitch/releases/tag/v1.10.7 No Types Assigned https://github.com/signalwire/freeswitch/releases/tag/v1.10.7 Release Notes, Third Party Advisory Changed Reference Type https://github.com/signalwire/freeswitch/security/advisories/GHSA-3v3f-99mv-qvj4 No Types Assigned https://github.com/signalwire/freeswitch/security/advisories/GHSA-3v3f-99mv-qvj4 Exploit, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:* versions up to (excluding) 1.10.7 -
CVE Modified by [email protected]
Oct. 26, 2021
Action Type Old Value New Value Added Reference http://seclists.org/fulldisclosure/2021/Oct/40 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41158 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-41158
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.20 }} -0.00%
score
0.58029
percentile