A vulnerability exists within Sourcegraph's gitserver component that allows a remote attacker to execute arbitrary OS commands by modifying the core.sshCommand value within the git configuration. This command can then be triggered on demand by executing a git push operation. The vulnerability was patched by introducing a feature flag in version 3.37.0. This flag must be enabled for the protections to be in place which filter the commands that are able to be executed through the git exec REST API.
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Ubuntu Security Notice 5256-1 - It was discovered that uriparser incorrectly handled certain memory operations. An attacker could use this to cause a denial of service.
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Ubuntu Security Notice 5510-2 - USN-5510-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 ESM. Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.
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