Ubuntu update for subversion

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

Update the affected package subversion to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

subversion (Ubuntu package): before 1.13.0-3ubuntu0.2

libsvn1 (Ubuntu package): before 1.13.0-3ubuntu0.2

libapache2-mod-svn (Ubuntu package): before 1.13.0-3ubuntu0.2

External links

http://ubuntu.com/security/notices/USN-5445-1

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

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

Update the affected package subversion to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

subversion (Ubuntu package): before 1.13.0-3ubuntu0.2

libsvn1 (Ubuntu package): before 1.13.0-3ubuntu0.2

libapache2-mod-svn (Ubuntu package): before 1.13.0-3ubuntu0.2

External links

http://ubuntu.com/security/notices/USN-5445-1

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.

3) 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

Description

The 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.

Mitigation

Update the affected package subversion to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

subversion (Ubuntu package): before 1.13.0-3ubuntu0.2

libsvn1 (Ubuntu package): before 1.13.0-3ubuntu0.2

libapache2-mod-svn (Ubuntu package): before 1.13.0-3ubuntu0.2

External links

http://ubuntu.com/security/notices/USN-5445-1

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.