Zero-day vulnerability in Subversion

Null pointer dereference
CVE-2011-1752

The vulnerability was discovered by Joe Schaefer.

Vulnerability details

Advisory: SB2011052602 - Denial of service in Apache Subversion

Vulnerable component: Subversion

CVE-ID: CVE-2011-1752

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:F/RL:O/RC:C

CWE-ID: CWE-476 - NULL Pointer Dereference

Description:

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to NULL pointer dereference in the mod_dav_svn module when processing baselined WebDAV resources. A remote attacker can create a specially crafted request, send it to the victim and cause the Subversion server to crash.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

http://subversion.apache.org/security/CVE-2011-1752-advisory.txt
https://lists.fedoraproject.org/pipermail/package-announce/2011-June/061913.html
https://www.ubuntu.com/usn/USN-1144-1/
https://lwn.net/Articles/446888/
http://ovaldb.altx-soft.ru/Definition.aspx?id=oval:com.altx-soft.nix:def:2140
https://groups.google.com/forum/#!topic/visualsvn/K6IsJpMWaA8

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.