#VU46729 Out-of-bounds write in libproxy - CVE-2020-25219

Vulnerability identifier: #VU46729

Vulnerability 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-2020-25219

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libproxy
Other software / Other software solutions

Vendor: libproxy

Description

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

url::recvline in url.cpp in libproxy 0.4.x through 0.4.15 allows a remote HTTP server to trigger uncontrolled recursion via a response composed of an infinite stream that lacks a newline character. This leads to stack exhaustion.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libproxy: 0.4.0 - 0.4.15

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External links
https://github.com/libproxy/libproxy/issues/134
https://lists.debian.org/debian-lts-announce/2020/09/msg00012.html

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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.