CVE-2021-31523 - log back

CVE-2021-31523 edited at 21 Apr 2021 20:00:13
Description
- A security issue has been found in xscreensaver before version 6.00. /usr/lib/xscreensaver/sonar allows arbitrary code to gain the CAP_NET_RAW capability by loading it using the unsanitised MESA_LOADER_DRIVER_OVERRIDE environment variable.
+ The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.
CVE-2021-31523 edited at 21 Apr 2021 19:54:02
References
https://www.openwall.com/lists/oss-security/2021/04/17/1
https://www.openwall.com/lists/oss-security/2021/04/21/3
https://www.openwall.com/lists/oss-security/2021/04/17/1/1
+ https://bugs.chromium.org/p/project-zero/issues/detail?id=2174
https://twitter.com/jwz/status/1383503845217554444
CVE-2021-31523 edited at 21 Apr 2021 19:44:32
Severity
- Unknown
+ Medium
Remote
- Unknown
+ Local
Type
- Unknown
+ Privilege escalation
Description
+ A security issue has been found in xscreensaver before version 6.00. /usr/lib/xscreensaver/sonar allows arbitrary code to gain the CAP_NET_RAW capability by loading it using the unsanitised MESA_LOADER_DRIVER_OVERRIDE environment variable.
References
+ https://www.openwall.com/lists/oss-security/2021/04/17/1
+ https://www.openwall.com/lists/oss-security/2021/04/21/3
+ https://www.openwall.com/lists/oss-security/2021/04/17/1/1
+ https://twitter.com/jwz/status/1383503845217554444
Notes
CVE-2021-31523 created at 21 Apr 2021 19:34:18