Denial of service in Apache Subversion
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-17525 |
| CWE-ID | CWE-476 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Subversion Server applications / Frameworks for developing and running applications |
| Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) NULL pointer dereference
EUVDB-ID: #VU50623
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-17525
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference when the Subversion is configured to use in-repository authz rules with the AuthzSVNReposRelativeAccessFile option. A remote non-authenticated attacker can send specially crafted request to a non-existing URL, trigger a NULL pointer dereference in the mod_authz_svn module and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSubversion: 1.9.0 - 1.14.0
External linkshttp://subversion.apache.org/security/CVE-2020-17525-advisory.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
