#VU47695 Buffer overflow in libproxy - CVE-2020-26154

Vulnerability identifier: #VU47695

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-26154

CWE-ID: CWE-120

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 execute arbitrary code.

url.cpp in libproxy through 0.4.15 is prone to a buffer overflow when PAC is enabled, as demonstrated by a large PAC file that is delivered without a Content-length header.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libproxy: 0.4.0 - 0.4.15

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External links
https://bugs.debian.org/968366
https://github.com/libproxy/libproxy/pull/126
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3BID3HVHAF6DA3YJOFDBSAZSMR3ODNIW/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WZVZXTFMFTSML3J6OOCDBDYH474BRJSW/

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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.