Remote DoS in Apache Subversion



| 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
 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

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3 External links

https://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

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-0203

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to an error when processing a certain sequence of commands within the svnserve process. A remote non-authenticated attacker can send specially crafted commends to the Subversion server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Subversion: 1.9.0 - 1.12.0 rc1

CPE2.3 External links

https://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 non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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