Short Name |
APP:CVS:ENTRY-TAG-OF |
---|---|
Severity |
Major |
Recommended |
No |
Recommended Action |
Drop |
Category |
APP |
Keywords |
CVS Entry Line Tag Heap Overflow |
Release Date |
2004/05/26 |
Update Number |
1213 |
Supported Platforms |
idp-4.1+, isg-3.5+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
This signature detects attempts to exploit a known vulnerability against Concurrent Versions System (CVS). Because CVS does not handle flag attachments correctly, attackers can send a malicious request to the CVS server to overwrite CVS memory, create a denial-of-service (DoS), or execute arbitrary code. To exploit this vulnerability, the attacker must use valid login ID and password for the CVS server, but an anonymous, read-only account is sufficient.
CVS is prone to a remote heap overflow vulnerability. This issue presents itself during the handling of user-supplied input for entry lines with 'modified' and 'unchanged' flags. This vulnerability can allow an attacker to overflow a vulnerable buffer on the heap, possibly leading to arbitrary code execution. CVS versions 1.11.15 and prior and CVS feature versions 1.12.7 and prior are prone to this issue. **UPDATE: Symantec has confirmed that this vulnerability is being actively exploited in the wild. Administrators are urged to upgrade and block external access to potentially vulnerable servers, if possible.