Squid Proxy up to 2.7.STABLE9/3.5.28/4.7 HTTP Header Authorization Header information disclosure

Summaryinfo

A vulnerability was found in Squid Proxy up to 2.7.STABLE9/3.5.28/4.7. It has been rated as critical. This vulnerability affects unknown code of the component HTTP Header Handler. This manipulation as part of Authorization Header causes information disclosure. This vulnerability is tracked as CVE-2019-12529. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Squid Proxy up to 2.7.STABLE9/3.5.28/4.7 (Firewall Software) and classified as critical. Affected by this vulnerability is an unknown function of the component HTTP Header Handler. The manipulation as part of a Authorization Header leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

The weakness was disclosed 07/11/2019 (Website). It is possible to read the advisory at squid-cache.org. This vulnerability is known as CVE-2019-12529 since 06/02/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2023). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-137765 and VDB-137766 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Squid

Name

• Proxy

Version

• 2.7.STABLE9
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8
• 3.5.9
• 3.5.10
• 3.5.11
• 3.5.12
• 3.5.13
• 3.5.14
• 3.5.15
• 3.5.16
• 3.5.17
• 3.5.18
• 3.5.19
• 3.5.20
• 3.5.21
• 3.5.22
• 3.5.23
• 3.5.24
• 3.5.25
• 3.5.26
• 3.5.27
• 3.5.28
• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7

License

• open-source

Website

• Vendor: http://www.squid-cache.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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