libxml2 2.9.10/2.9.11/2.9.12/2.9.13/2.9.14 lxml null pointer dereference

CVSS Meta Temp Score
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6.0$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in libxml2 2.9.10/2.9.11/2.9.12/2.9.13/2.9.14 (Document Processing Software). Affected by this issue is an unknown code block of the component lxml. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

The weakness was disclosed 07/05/2022. The advisory is available at huntr.dev. This vulnerability is handled as CVE-2022-2309 since 07/05/2022. The technical details are unknown and an exploit is not available.

Applying the patch 86368e9cf70a0ad23cccd5ee32de847149af0c6f is able to eliminate this problem. The bugfix is ready for download at github.com.

Productinfo

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Name

Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (huntr.dev): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 86368e9cf70a0ad23cccd5ee32de847149af0c6f

Timelineinfo

07/05/2022 🔍
07/05/2022 +0 days 🔍
07/05/2022 +0 days 🔍
07/19/2022 +14 days 🔍

Sourcesinfo

Advisory: 86368e9cf70a0ad23cccd5ee32de847149af0c6f
Status: Confirmed

CVE: CVE-2022-2309 (🔍)

Entryinfo

Created: 07/05/2022 15:08
Updated: 07/19/2022 08:29
Changes: 07/05/2022 15:08 (51), 07/19/2022 08:27 (1), 07/19/2022 08:29 (18)
Complete: 🔍

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