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CVE-2019-12529

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 4507-1
Posted Aug 26, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4507-1 - Several vulnerabilities were discovered in Squid, a fully featured web proxy cache. The flaws in the HTTP Digest Authentication processing, the HTTP Basic Authentication processing and in the cachemgr.cgi allowed remote attackers to perform denial of service and cross-site scripting attacks, and potentially the execution of arbitrary code.

tags | advisory, remote, web, denial of service, arbitrary, cgi, vulnerability, xss
systems | linux, debian
advisories | CVE-2019-12525, CVE-2019-12527, CVE-2019-12529, CVE-2019-12854, CVE-2019-13345
MD5 | 0b6d68d6e455fb14945370ed3a945be0
Ubuntu Security Notice USN-4065-2
Posted Jul 22, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4065-2 - USN-4065-1 fixed several vulnerabilities in Squid. This update provides the corresponding update for Ubuntu 12.04 ESM. It was discovered that Squid incorrectly handled Digest authentication. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-12525, CVE-2019-12529
MD5 | a5bc70093a64fbd1da6b810eab04cae7
Ubuntu Security Notice USN-4065-1
Posted Jul 18, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4065-1 - It was discovered that Squid incorrectly handled Digest authentication. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. It was discovered that Squid incorrectly handled Basic authentication. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.04. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2019-12525, CVE-2019-12527, CVE-2019-12529
MD5 | 4f76b96ab8a7b06f1886fa584c06000c
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