Remote DoS in Apache Subversion

Published: 2019-07-31 | Updated: 2019-08-07

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-11782 CVE-2019-0203
CWE-ID	CWE-617 CWE-20
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 information about 2 vulnerabilities.

UPDATED: 07.08.2019

Corrected the list of vulnerable and fixed versions.

1) Reachable Assertion

EUVDB-ID: #VU19589

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-11782

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when handling svnserve 'get-deleted-rev' requests. A remote authenticated attacker with read-only permissions can make the server to reply with incorrect revision number that will lead to svnserve crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Subversion: 1.9.0 - 1.12.1

External links

http://subversion.apache.org/security/CVE-2018-11782-advisory.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU19590

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-2019-0203

CWE-ID: CWE-20 - Improper input validation