High severity · published Aug 10, 2023
CVE-2023-39957
Path traversal allows tricking the Talk Android app into writing files into it's root directory
7.8
CVSS
0.4%
EPSS
No
On KEV
Description
Nextcloud Talk Android allows users to place video and audio calls through Nextcloud on Android. Prior to version 17.0.0, an unprotected intend allowed malicious third party apps to trick the Talk Android app into writing files outside of its intended cache directory. Nextcloud Talk Android version 17.0.0 has a patch for this issue. No known workarounds are available.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
< 17.0.0 · source: vendor
TA
Talk · Nextcloud
before 17.0.0; 17.0.0; 17.0.0; 17.0.0 · source: NVD, CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-39957
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-39957
Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36f7-93f3-mcfj
Patch
https://github.com/nextcloud/talk-android/pull/3064
Issue Tracking
https://hackerone.com/reports/1997029
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