Kamailio SIP up to 5.4.x Invite Request buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Kamailio SIP up to 5.4.x. Affected by this issue is some unknown functionality of the component Invite Request Handler. This manipulation causes buffer overflow. This vulnerability is tracked as CVE-2020-27507. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Kamailio SIP up to 5.4.x (IP Phone Software). Affected by this vulnerability is an unknown functionality of the component Invite Request Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect availability. The summary by CVE is:

The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

The weakness was disclosed 03/15/2023 as 2503. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2020-27507 since 10/21/2020. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.5.0 eliminates this vulnerability. Applying the patch ada3701d22b1fd579f06b4f54fa695fa988e685f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.6

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kamailio SIP 5.5.0
Patch: ada3701d22b1fd579f06b4f54fa695fa988e685f

Timelineinfo

10/21/2020 🔍
03/15/2023 +875 days 🔍
03/15/2023 +0 days 🔍
02/27/2025 +715 days 🔍

Sourcesinfo

Advisory: 2503
Status: Confirmed

CVE: CVE-2020-27507 (🔍)
GCVE (CVE): GCVE-0-2020-27507
GCVE (VulDB): GCVE-100-223147

Entryinfo

Created: 03/15/2023 21:42
Updated: 02/27/2025 20:44
Changes: 03/15/2023 21:42 (43), 02/27/2025 20:44 (26)
Complete: 🔍
Cache ID: 216::103

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